1 . 综合与实践
问题情境
在综合与实践课上,老师出示了两张全等的三角形纸片
,其中
,
,
.如图
,三角形纸片
与三角形纸片
重合,然后将纸片
绕点
顺时针旋转(旋转角不超过
),
与
交于点
,
与
交于点
.
操作与计算
(
)如图
,当
时,求
的长.
深度思考
(
)“雄鹰”小组受到了启发,提出了问题:如图
,当
时,试猜想
与
的数量关系,并说明理由.
拓展探究
(
)“智慧”小组进一步研究.如图
,过点
作
的平行线交
于点
,过点
作
的平行线交
于点
,连接
.当
时,直接写出四边形
的面积.
问题情境
在综合与实践课上,老师出示了两张全等的三角形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c5a1b5af8099353be1560c085ec3a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4faa61e76585aa348b6d93b8842e990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32cd85d0cc331d47061562a498325567.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17c2e74ba16cfbc7ae2a7b1149672e23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af6c9a36e2ef7189317ae652c56e49c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
操作与计算
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aad38b43462ca7a8fb9bc9484ad3a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
深度思考
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7990cc55289f09c4e67860bb64bb2b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3064b70f24e9bbcab76e0dc61274b9b.png)
拓展探究
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a0d584685408f8529cc9933a9a66ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8b9982a8335c4d17dbedb3c8161070f.png)
您最近一年使用:0次
2024-04-23更新
|
117次组卷
|
2卷引用:2024年山西省晋中市和顺县中考一模数学试题
2 . 某数学学习小组学习完四边形后进行了如下探究,已知四边形
为矩形,请你帮助他们解决下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/bffe69d3-dcf4-4aa1-9fe7-908c21d2a5e0.png?resizew=447)
(1)【初步尝试】:他们将矩形
的顶点
、
分别在如图(1)所示的
的边
、
上,顶点
、
恰好落在
的对角线
上,求证:
;
(2)【深入探究】:如图2,若
为菱形,
,若
,求
的值;
(3)【拓展延伸】:如图(3),若
为矩形,
;
且
,请直接写出此时
的值是________(用含有
,
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/bffe69d3-dcf4-4aa1-9fe7-908c21d2a5e0.png?resizew=447)
(1)【初步尝试】:他们将矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0f90a3773e6944013a0eb41279f332f.png)
(2)【深入探究】:如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a3ae16e3f4a6b8994eb716f8502ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e9fe9bcc967fb43ea66ab995f7c1c9.png)
(3)【拓展延伸】:如图(3),若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3be96420ac78c8621fcb47a45514fa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd7be5da220f32cb7c8aad9ca5ced32e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a3ae16e3f4a6b8994eb716f8502ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01943be6d886ec97fc1c18e73b0d4ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2024-01-18更新
|
155次组卷
|
3卷引用:广东省深圳市南山区2023-2024学年九年级上学期期末数学试题
3 . 问题提出:
我们知道菱形的面积不仅可以用底乘以高来求,而且知道菱形的面积等于对角线乘积的一半.那么我们日常生活中常见的风筝的形状即“筝形”是不是也可以用这种方法求面积呢?
如图1,四边形
是我们常见的风筝的图案,其中对角线
长为
,
长为
,
垂直平分
,垂足为E,求:筝形
的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/be8e05e1-9f62-436f-94be-1132435b85cc.png?resizew=767)
解析:由已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d67b6430a35f804b596096236d78ad.png)
我们发现这个结论对于筝形依然成立.
类比探究:
满足什么条件的图形可以通过这种方法求面积呢?让我们先研究下面图形的面积:
如图2,四边形
的对角线
、
互相垂直,其中对角线
长为
,
长为
,垂足为E,求四边形
的面积.(请写出求解过程)
由此,我们可以得出一个结论:
结论1:对角线互相垂直的四边形的面积等于______________________.
拓展提高:
由上述的结论1给我们的启示:对于两条对角线不垂直的四边形的面积如何求解呢?下面让我们一起来研究
如图3所示四边形
的对角线
长为
,点A到
的距离与点C到
的距离之和为
,求四边形
的面积.(请写出求解过程)
结论2:任意四边形的面积等于______________________.
问题解决:
(1)如图4,矩形
中,
,
,
,点G、H分别是
、
上任一点,则四边形
的面积等于________
.
(2)如图5,四边形
放在了一组平行线中,已知
,四边形
的面积为
,则两条平行线间的距离为_______
.
我们知道菱形的面积不仅可以用底乘以高来求,而且知道菱形的面积等于对角线乘积的一半.那么我们日常生活中常见的风筝的形状即“筝形”是不是也可以用这种方法求面积呢?
如图1,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e476067ee83f0666b74ef0576567c7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86cacebfac933f2d9894147286bdd4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/be8e05e1-9f62-436f-94be-1132435b85cc.png?resizew=767)
解析:由已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d67b6430a35f804b596096236d78ad.png)
我们发现这个结论对于筝形依然成立.
类比探究:
满足什么条件的图形可以通过这种方法求面积呢?让我们先研究下面图形的面积:
如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86cacebfac933f2d9894147286bdd4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c7fe3005afef489db48566e2acfc9ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
由此,我们可以得出一个结论:
结论1:对角线互相垂直的四边形的面积等于______________________.
拓展提高:
由上述的结论1给我们的启示:对于两条对角线不垂直的四边形的面积如何求解呢?下面让我们一起来研究
如图3所示四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86cacebfac933f2d9894147286bdd4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c7fe3005afef489db48566e2acfc9ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
结论2:任意四边形的面积等于______________________.
问题解决:
(1)如图4,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d291cfc6c4677d20f8674c57322b46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df3b2901ad26337818f75e81448ebb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d354155f71a1736c1c9186168695edd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ce13774b09ff2edddaf21a072cf60a.png)
(2)如图5,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4f71a52438196c3aca604fa927be8e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2c7aaa24c251b10f1c7a0dce744602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
您最近一年使用:0次
4 . 模型探究:(1)如图1,在四边形
中,
,
,
于点E,若
,求四边形
的面积.
拓展应用:(2)如图2,在四边形ABCD中,
,
,
于点E,若
,
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d30cd3e53a9df24fe6da5e8a3a7ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
拓展应用:(2)如图2,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/555bfe8dfaaf36f3b784c53c61f3e775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df8003814834287e122a12b64a936dba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/24/967e1ec0-4499-4c32-8979-2ec4f4ed180c.png?resizew=245)
您最近一年使用:0次
名校
5 . [教材呈现]下面是华师版八年级下册数学教材第104页的部分内容.
如图,
、
是
的两条直径,四边形
是矩形吗?证明你的结论.
![](https://img.xkw.com/dksih/QBM/2023/3/6/3188631496925184/3190862349164544/STEM/aa1a22cacdaa4af39a9dae7aea122050.png?resizew=466)
(1)[问题解决]如图①,
、
是
的两条直径.求证:四边形
是矩形.
[发现结论]矩形的四个顶点都在以该矩形对角线的交点为圆心,对角线的长为直径的圆上.
(2)[结论应用]如图②,已知线段
,以线段
为对角线构成矩形
,矩形
面积的最大值为 .
(3)[拓展延伸]如图③,在矩形
中,
,
,点
、
分别为边
、
的中点,以线段
为对角线构造矩形
,矩形
的边与矩形
的对角线
交于
、
两点,当
的长最长时,矩形
的面积为 .
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
![](https://img.xkw.com/dksih/QBM/2023/3/6/3188631496925184/3190862349164544/STEM/aa1a22cacdaa4af39a9dae7aea122050.png?resizew=466)
(1)[问题解决]如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
[发现结论]矩形的四个顶点都在以该矩形对角线的交点为圆心,对角线的长为直径的圆上.
(2)[结论应用]如图②,已知线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
(3)[拓展延伸]如图③,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9228b213dc6b256b752b38a466ebec93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
您最近一年使用:0次
6 . 【探索发现】
如图1,是一张直角三角形纸片,
,小明想从中剪出一个以
为内角且面积最大的矩形,经过多次操作发现,当沿着中位线DE、EF剪下时,所得的矩形的面积最大,随后,他通过证明验证了其正确性,并得出:矩形的最大面积与原三角形面积的比值为______.
【拓展应用】
如图2,在
中,
,BC边上的高
,矩形PQMN的顶点P、N分别在边AB、AC上,顶点Q、M在边BC上,求出矩形PQMN面积的最大值
用含a、h的代数式表示
;
【灵活应用】
如图3,有一块“缺角矩形”ABCDE,
,
,
,
,小明从中剪出了一个面积最大的矩形
为所剪出矩形的内角
,直接写出该矩形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/809da6723d608809e6aba07e2f833964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5faeffd7e83b1157eca19dcd9b6aea8d.png)
【拓展应用】
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882589c896c6993d9687f0e14a283481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48bb706a908b2e4f2263797bf30a6ff6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4ad1dc4285705ae37679aa2dbd042af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
【灵活应用】
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b19072be3c450227b7a03d3096d75e36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffd3b3cf3e99b815b2e4a1e20cd1d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eca7a1bfdf5b63bbbd801ed3d185c0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c0c2a95a4e81da055fa5f8d45721b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc52bfca1031cc3a3d4ed7b8179375cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://img.xkw.com/dksih/QBM/2019/3/26/2168917398814720/2169809940701184/STEM/ac8f04ea359a4685a6d0b8e442e44d2c.png?resizew=331)
您最近一年使用:0次
名校
7 . 问题探究
中,E,F,G,H分别是边
,
,
,
上的点(不与
的顶点重合),连接
,
,当
,
时,求证:
.
问题解决
(2)某设计师根据客户要求在一块圆形场地进行布景设置.如图2,设计师通过设计软件画出圆形场地,记作
,主区域
内接于
,
经过圆心O,M为
上一点,
,
,垂足分别为E,F,要求
.观赏区为
与
,已知
.设
,观赏区
与
的面积的和为
.
①求S与x之间的函数关系式.
②当S最大时,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6b4e97618f0af8c34ce1e9439f57416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec88344eba7ecacdcffea57c46858f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fc875d6109cbef8979486fd48b5683.png)
问题解决
(2)某设计师根据客户要求在一块圆形场地进行布景设置.如图2,设计师通过设计软件画出圆形场地,记作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd2b7f0278281f7864a5e3ee440857a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/578f5b6d50ce105d5dc6fa43ede14e19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21786fe6fbbd671ba5158f4a920b8884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d493b4c84d8dc832e323a0bcd0db5589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099533e271f73c7296f42b9219fc7b41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8e353fe2a2d40f35b2a55b3785ba36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21786fe6fbbd671ba5158f4a920b8884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d493b4c84d8dc832e323a0bcd0db5589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ec46ba5eab5c6e3f9a7788eda30a57.png)
①求S与x之间的函数关系式.
②当S最大时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
8 . 问题提出
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/2e1e1b18-a5e0-4f23-b455-bb7cf950654a.png?resizew=436)
如图
,在
中,
.若
,则
的值为__________.
问题探究
如图
,在四边形
中,对角线
、
相交于点
,
、
、
、
分别为
、
、
、
的中点,连接
、
、
、
.若
,求四边形
的面积.
问题解决
如图
,某市有一块五边形空地
,其中
米,
米,
米,
米,现计划在五边形空地内部修建一个四边形花园
,使点
、
、
、
分别在边
、
、
、
上,要求
请问,是否存在符合设计要求的面积最大的四边形花园
?若存在,求四边形
面积的最大值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/2e1e1b18-a5e0-4f23-b455-bb7cf950654a.png?resizew=436)
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4d24c1c0d75be03afbfe64a41aee7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
问题探究
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87448e09eaa816e50ae92d111d5ded6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cafbe2751f4f4c5a8e676818195e9111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0989ab6363e37ecee4565ded7891fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87a0802a3da63fbf219b527636864cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89029e1d782dbf6a0bda8605a7c5ad4.png)
问题解决
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6723f8b9d907981aa735cd96386bee36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eeec9cb156d9fbb9ac1bf3f9a675260.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fb19963d0798aabcb1b4b8b951bc302.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd81878e3c1a10e9cc9f056f09b2eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78245a4a4d968e5f8b78606505d8733d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e420f0021f02177e7818224e7b90c2cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84cf2eac4f5d07bb7e68795462bd3732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e420f0021f02177e7818224e7b90c2cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e420f0021f02177e7818224e7b90c2cf.png)
您最近一年使用:0次
9 . 定义:有一个角是直角的平行四边形叫做矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/26/4cf8e596-ee07-4b24-bcb8-f55fecd522b9.png?resizew=576)
(1)根据定义判矩形
已知:如图1,在平行四边形
中,
是它的两条对角线,
.求证:平行四边形
是矩形.
(2)动手操作有发现
如图2,在矩形
中,
是
的中点,将
沿
折叠后得到
,点
在矩形
内部,延长
交
于点
.猜想线段
与
有何数量关系?并证明你的结论.
(3)类比探究到一般
如图3,将(2)中的矩形
改为平行四边形,其它条件不变,(2)中的结论是否仍然成立,请说明理由.
(4)解决问题巧应用
如图4,保持(2)中的条件不变,若
点是
的中点,且
,请直接写出矩形
的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/26/4cf8e596-ee07-4b24-bcb8-f55fecd522b9.png?resizew=576)
(1)根据定义判矩形
已知:如图1,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)动手操作有发现
如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2698f08d94afa1cd5b81444791f4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
(3)类比探究到一般
如图3,将(2)中的矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(4)解决问题巧应用
如图4,保持(2)中的条件不变,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
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2023-03-20更新
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310次组卷
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2卷引用:山东省淄博市张店区2022-2023学年八年级上学期期末数学试题
10 . 【问题探究】
(1)如图1,已知
,点D是
的中点,连接
,则
(填“
”“
”或“
”)
(2)如图2,在梯形
中,
,请过点A作一条直线
平分梯形
的面积,点P是
与
的交点,并说明理由;
【问题解决】
(3)如图3是某公园的一块空地,由
和四边形
组成,
,
,
米,
,
,公园管理人员现准备过点A修一条笔直的小路
(小路面积忽略不计),将这块空地分成面积相等的两部分(点M在
边上),分别种植两种不同的花卉,请在图中确定点M的位置,并计算小路
的长.(结果保留根号)
(1)如图1,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4673ef63a8d89687b96ee09887ac3daa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c141b06b158e0cdef08fcda3ea44a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(2)如图2,在梯形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80672dda9430cb42b3136bcb1b67bbad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
【问题解决】
(3)如图3是某公园的一块空地,由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa485cf3776f36aaf4abaadaf30fb85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077956e5f55232814d1a077af264590e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56b1879d919064e3839b8aea8d3459b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b41f2f95d643629321deb6e905c4f1ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a868322c7ec1b016a23df3ea18183080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d61f0d746987c2f76f5e061f71fc45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25120e4c19a21da5596451798c255902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/cf4b2284-4668-4b14-a781-d5fb8b49e7e8.png?resizew=465)
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