1 . 在拓展课常上,共学小组的同学用两个完全相同 的长方形纸片展开探究活动,这两张长方形纸片的长为4,宽为2.
(1)小红将两个完全相同的长方形纸片
和
摆成图
的形状,点
与点
重合,边
与边
重合,边
,
在同一直线上,试探究
的形状,并说明理由.
【解决问题】
(2)如图2,在(1)的条件下,小明将长方形
绕点
顺时针转动
,边
与边
交于点
,连接
,若
时,求
的值.
【拓展研究】
(3)从图1开始,小亮将长方形
绕点
顺时针转动一周,若直线
与线
所成夹角为
时,请直接写出
的面积.
(1)小红将两个完全相同的长方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35992b319d8c74435ee9f08d0b4b3f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3d566704b44ea4ef1f99c37bd46902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a33d27a9c655d01f606e9bce02b0a5.png)
【解决问题】
(2)如图2,在(1)的条件下,小明将长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35992b319d8c74435ee9f08d0b4b3f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b15d8aaf5307e6c3282bffafb4b84f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5783f404ef983f048e034a17db5fd814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
【拓展研究】
(3)从图1开始,小亮将长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35992b319d8c74435ee9f08d0b4b3f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c030b25575d683af91c06e6a3e4f463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128638e48e657f8347943f8aae79545a.png)
您最近一年使用:0次
名校
2 . 操作初探:
(1)如图1,将正方形纸片
对折,使
与
重合,展平纸片,得到折痕
;再对折,使
与
重合,得到折痕
,展平纸片,连接
,与
交于点
,连接
,
.则
的值为________;
猜想证明:
(2)如图2,将正方形纸片
对折,使
与
重合,展平纸片,得到折痕
;点
在
边上,连接
,与
交于点
,连接
,将
绕点
逆时针旋转,使点
的对应点
'落在对角线
上,连接
.当点
在边
上运动时(点
不与
,
重合),试判断
的形状,并说明理由.
拓展探究:
(3)如图3,在(2)的条件下,延长
交
于点
,连接
,
.当
平分
时,请证明
.
(1)如图1,将正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cafbe2751f4f4c5a8e676818195e9111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7ea03277f8408fabe5b327cc34838f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365822bd3945e6a3e871ca979c84cc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f1f15f0de2b8b8da87056362fbea5a.png)
猜想证明:
(2)如图2,将正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14bc9983f123701604ea131508334e15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ed9ac5ae3774f97db118b790aab46ba.png)
拓展探究:
(3)如图3,在(2)的条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13af018556f0b484ed38519f2edc791c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365822bd3945e6a3e871ca979c84cc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365822bd3945e6a3e871ca979c84cc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63005a1a1f37e4d90369d71d4f91d2a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd54f390e1c87bff710879a4a31ca93b.png)
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2卷引用:2024年陕西省西安市雁塔区陕西师范大学附属中学中考九模数学试题
3 . 在数学兴趣小组活动中,小明同学遇到了如下问题:
中,
,点
在其内部,
,
,
,求
的长;
经过同学们的观察、思考、交流,对上述问题形成了如下想法:将
绕点
按逆时针方向旋转
,得到
,连接
,探究
三边之间的数量关系,…根据以上分析过程
______.
(2)【类比分析】如图2,在等边
中,点
在其内部,且
,
,
.求
的度数.
(3)【拓展应用】①如图3,在
中,
,点
在其内部,
是等腰三角形,且
.若
,
,求
的长.
②如图4,在
中,
,
,点
为平面内一点,若
,
,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69014a4cda821d97f56d6f6a8313de3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87261df80b82221732329b6ef3fdda7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
经过同学们的观察、思考、交流,对上述问题形成了如下想法:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a1eda00fc2d64ce3a42004b24adf00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a463aaad04beefc2ed12d694d687f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d0f08eb47a5429245f4c162d0355a45.png)
(2)【类比分析】如图2,在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08aa6fd52f3933cbded9ce8c880b4a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f82a30d6b232dc4d8f35d2d6e0e0f42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
(3)【拓展应用】①如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39c7b0e15bfcf4bd7214320bc40f5373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ae16b72924eb24c45f5dcfab07cc01b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c20f08ca44f10e3f184fb0e9b2907921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9b9bb0f509e6f3d30858efb217c1f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f4cb33cdb3e2994ac7b9a0abbabed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5033d9a2986cad7932b61d67c17de658.png)
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40次组卷
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2卷引用:辽宁省辽阳市2023-2024学年八年级下学期期中数学试题
4 . 问题呈现:借助几何图形探究数量关系,是一种重要的解题策略,图1,图2是用边长分别为a,b的两个正方形和边长为a,b的两个长方形拼成的一个大正方形.利用图形可以推导出的乘法公式分别是图1:
,图2:
:
数学思考:利用图形推导的数学公式解决问题.
,
,求
的值;
(2)已知
,求
的值.
(3)拓展运用:如图3,点
是线段
上一点,以
,
为边向两边作正方形
和正方形
,面积分别是
和
.若
,
,则直接写出
的面积.(用S,m表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02d351a97edcc0783d8d7a02d041bdb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194c8e87fbce2ab6bae776f4631414fa.png)
数学思考:利用图形推导的数学公式解决问题.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9e1619ef7c6970c9187553661a5a6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6235c44577bf7780a5eee35b666ce97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffc91b4914d341429480ac58d9bbbb99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42846b9c519997d282841869091160df.png)
(3)拓展运用:如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/468b128ad3053f6cbd67ee98f20ce068.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa375c3888b332f24e7d0f9b9600c694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e6151dc6ef89bc79b1ca0dc63b291e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02763d661acaa5b3799585f9fa64977e.png)
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5 . 综合与实践
【提出问题】
在一次数学活动课上,老师提出这样一个问题:如图,正方形
中,点
是射线
上的一个动点,过点
作
交正方形的外角
的平分线于点
.求证:
.
在边
上时,小明的证明思路如下:
在
上截取
,连接
.
则易得
,
,______.
.
.
补全小明的证明思路,横线处应填______.
【深入探究】
(2)如图2,在(1)基础上,过点
作
交直线
于点
.以
为斜边向右作等腰直角三角形
,点
在射线
上.求证:
;
【拓展应用】
(3)过点
作
交直线
于点
.以
为斜边向右作等腰直角三角形
,点
在射线
上.当
,
时,请求出线段
的长.
【提出问题】
在一次数学活动课上,老师提出这样一个问题:如图,正方形
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a19339adac3a2f1aab1fbc11b1c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/813507ac13ded6b8941b664fbd379fc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75b5d4c7feb93c8ee84f1b3c39f73ce0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
则易得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81687b4fa1795755b75c0644bdd3fc09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45c75a7c3456584754c8a52ddc5bb9a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6e83c1234e90b0d2ef60296dc369efb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8032d724d3fd498bc7aec233d71899b.png)
补全小明的证明思路,横线处应填______.
【深入探究】
(2)如图2,在(1)基础上,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7baeb8f9a161f2822e5cdb51aed3e1c2.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/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ccb46ed82725253ab3cb381664047f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2e29770dc2db6536f6570f44ef5152.png)
【拓展应用】
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7baeb8f9a161f2822e5cdb51aed3e1c2.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/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ccb46ed82725253ab3cb381664047f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
您最近一年使用:0次
名校
6 . 某数学兴趣小组在数学课外活动中,对多边形内两条互相垂直的线段做了如下探究:
(1)如图1,在正方形
中,点E,F分别是
,
上的两点,连接
,
,
,则
的值为_____;
(2)如图2,在矩形
中,
,
,点E是
上的一点,连接
,
,且
,则
______.
【类比探究】
(3)如图3,在四边形
中,
,点E为
上一点,连接
,过点C作
的垂线交
的延长线于点G,交
的延长线于点F,求证:
;
【拓展延伸】
(4)如图4,在
中,
,
,
,将
沿
翻折,点A落在点C处得
,点E,F分别在边
,
上,连接
,
,
.求
①
的值;
②连接
,若
,求
的值.
(1)如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
(2)如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fc5225dfcb420741b54f5601df29f2d.png)
【类比探究】
(3)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41aba1711910c6f533cc94319104f4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb545c1a90c841d0d25070cf62b64e3.png)
【拓展延伸】
(4)如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16834582e86f9c1030a4a4b316fab909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53289e3083b05d556dd30197abc547ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73636989e83905f8800a865c2b608c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08341fa8b1827c032f796e5f88941b78.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
您最近一年使用:0次
7 . 在学完有关中点的复习课后,陈老师带领同学们探究这样一道几何题:正方形
和正方形
共顶点A,连接
,取
的中点M,连接
.试探究
的形状.
以下是智慧小组的探究过程.
【特例探究】如图1,点G在边
上.
是等腰直角三角形,并给出了如下证明思路:
从M是
的中点入手,延长
交
于点N,如图2.
,得到
,
.
由于
,
,故
________.
所以
是________.
再结合M是
的中点从而可得结论.
(1)横线处应填:________,________.
【类比探究】
(2)如图3,将正方形
绕点A旋转,其他条件不变,在旋转过程中,试探究
的形状是否发生变化,并就图3的情形说明理由.
(3)在(2)的条件下,已知
,
,当点A,G,M在同一条直线上时,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/050370ba202f5802cf19a371d3cb116d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a690101e5595786c62946c4b29b665f4.png)
以下是智慧小组的探究过程.
【特例探究】如图1,点G在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a690101e5595786c62946c4b29b665f4.png)
从M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9e953a4a5f98c96bbe67cbaadf76d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02f72f2bc5969ac21b34b0bfe8ea23e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/031676fa40a8a376eaa1a1c3a4c22c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350fb9c57b7802bd0e90baa3d4b60a5e.png)
由于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98c1dfc78642403761629836868da743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478d8cdad9506e889570ca6618a49615.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b8358533955a34c35db8b8045b4135.png)
再结合M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a459f78e4a3516d8a8535290ede7f386.png)
(1)横线处应填:________,________.
【类比探究】
(2)如图3,将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a690101e5595786c62946c4b29b665f4.png)
(3)在(2)的条件下,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6cee83d36c4da913e0790e5070c46f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
您最近一年使用:0次
8 . 【问题探究】
(1)如图①,点P是等边
内一点,
,
,
,则
的度数为______;
【类比迁移】
(2)如图②,若点P是正方形
内一点,
,
,
,求
的长;
【拓展应用】
(3)如图③,某公园有一块矩形水池
,
米,
米,为方便观赏游玩,工作人员计划在水池内P,Q两点处增加亭台,连接
,且
,怎样选择点P和点Q的位置,可以使
最小?并求出
的最小值.
(1)如图①,点P是等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08aa6fd52f3933cbded9ce8c880b4a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2899e607479d8d1c47d954ae9ebb7144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
【类比迁移】
(2)如图②,若点P是正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26a42b05e06fe34d66538930787bb3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fddda9e7f4d7140bf357d76c9e23d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
【拓展应用】
(3)如图③,某公园有一块矩形水池
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c07006e70cee23a10f193d71697a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a133a98e448440ed6837ba44deb4156e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b47a4f8a5ca1dffd106f3dba1bba32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a5a539bda7c553847a68a4fbc645ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abe9d3e8a90b93326efbb14a13cdc8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abe9d3e8a90b93326efbb14a13cdc8f.png)
您最近一年使用:0次
9 . 王老师在进行“图形的变化”主题教学时,设计了如下版块.
【观察发现】
(1)如图1,在正方形网格中(每个小正方形的边长都是1),点
均在格点上(网格线的交点),且点P在线段
上,连接
,将
绕点P顺时针旋转,使点C的对应点D落在线段
上,分别作
关于直线
的对称线段
和
.则
①
______
;
②线段
可以看作是由线段
绕点P顺时针旋转______
得到.
【深入探究】
(2)如图2,
,P为
上一点,连接
,将
绕点P顺时针旋转,使点C的对应点D落在射线
上,分别作
关于直线
的对称线段
和
.请回答下列问题:
①求
的度数;
②连接
,请判断线段
之间的数量关系,并说明理由.
【拓展应用】
(3)在(2)的条件下,连接
,当
,
时,请直接写出线段
的长.
【观察发现】
(1)如图1,在正方形网格中(每个小正方形的边长都是1),点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c398257503e36a22a5e0b9e0e6d9f9a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf0a766ef79b92902be0a9b6d152685.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4397f6e86c69e6b597e7e8635afbfb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
②线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
【深入探究】
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf0a766ef79b92902be0a9b6d152685.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1513a2e14d9e8b78767766d93ad33593.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f3c22dc64bb06544684c5ba23ed1586.png)
【拓展应用】
(3)在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
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2024-06-04更新
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72次组卷
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2卷引用:2024年河南省南阳市西峡县九年级中考二模考试数学试题
10 . 综合与实践
主题任务 | “我的校园我做主”草坪设计 | |||||||||||||||||||||||||
入项探究环节 | 任务背景 | 学校举办“迎五一,爱劳动”主题实践活动,九(2)班参加校园美化设计任务: 校园内有一块宽为31米,长为40米的矩形草坪,在草坪上设计两条小路, 具体要求: (1)矩形草坪每条边上必须有一个口宽相等的路口; (2)两条小路必须设计成平行四边形; | ||||||||||||||||||||||||
驱动任务一 | 九(2)班各个实践小组的设计方案汇总后,主要有甲、乙、丙三种不同的方案(如图1):![]() ![]() ![]() | |||||||||||||||||||||||||
深入探究 | 驱动任务二 | 验证猜想:各个实践小组用如表格进行研究:
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驱动任务三 | (3)如果甲种方案除小路后草坪总面积约为1170平方米.请计算两条小路的宽度是多少? | |||||||||||||||||||||||||
拓展探究 | 驱动任务四 | 为了深入研究,各个小组选择丙方案(如图2)进行研究.若两条小路与矩形两组对边所夹锐角![]() (4)若 ![]() ![]() ![]() ![]() (5)若 ![]() ![]() ![]() ![]() |
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