已知,如图,矩形ABCD中,AD=6,DC=8,菱形EFGH的三个顶点E,G,H分别在矩形ABCD的边AB,CD,DA上,AH=2,连接CF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/b2af745c-4a11-418f-bff6-c7544e456581.png?resizew=262)
(1)若DG=2,则四边形EFGH的形状为______.
(2)若DG=5,求△FCG的面积.
(3)当DG为何值时,△FCG的面积最小,并求这个最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/b2af745c-4a11-418f-bff6-c7544e456581.png?resizew=262)
(1)若DG=2,则四边形EFGH的形状为______.
(2)若DG=5,求△FCG的面积.
(3)当DG为何值时,△FCG的面积最小,并求这个最小值.
更新时间:2022-07-06 22:25:50
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解答题-作图题
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【推荐1】尺规作图只允许使用直尺和圆规来解决平面几何作图题,下面我们用尺规作图来解决一些问题.
【回顾复习】下列作图语句表述正确的是______.
①延长射线OA;
②已知线段AB,作
;
③作直线AB等于直线CD;
④以某定点为圆心,以固定的长为半径画圆弧.
【课本呈现】
【小试牛刀】小明同学发现,在OA,OB上分别截取OM,ON,使
,并将两个完全相同的直角三角尺按如图1所示的样子摆放,也可以得到OP为
的平分线,你认为这种做法正确吗?请说明理由.
【问题解决】如图2,
是边长为2的等边三角形,直线l经过顶点A,且与边BC平行,仅用尺规在直线1上找出点P,使得
,并直接写出BP的长度(保留作图痕迹,不写作法).
【回顾复习】下列作图语句表述正确的是______.
①延长射线OA;
②已知线段AB,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f537e7bd7742eb543279795b98e83157.png)
③作直线AB等于直线CD;
④以某定点为圆心,以固定的长为半径画圆弧.
【课本呈现】
已知:![]() 求作: ![]() 作法:(1)以点O为圆心,适当长为半径画弧,交OA于点M,交OB于点N. (2)分别以点M,N为圆心,大于 ![]() ![]() 画射线OC,射线OC即为所求. ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2032fccdf9ab12429aae024d67b19d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
【问题解决】如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/956b88a04f8a78c52696419b61dbc4cc.png)
![](https://img.xkw.com/dksih/QBM/2022/4/14/2958182302171136/2959626404159488/STEM/375c625ee6fd4bd68b643ef63986161e.png?resizew=334)
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【推荐2】如图,D是△ABC边BC上的点,连接AD,∠BAD=∠CAD,BD=CD.
用两种不同方法证明AB=AC.
用两种不同方法证明AB=AC.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/24/8e325bb1-e9fa-4d4c-bbda-47c0b22cd885.png?resizew=247)
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【推荐1】[基础巩固]
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/bfe5b616-a3dd-4385-9ce5-2f28e9fd849c.png?resizew=337)
(1)如图①,在
中,
,
于点
,求证:
.
[尝试应用]
(2)如图②,在矩形
中,
,点
在
上,
,
于点
,求
的长.
[拓展提高]
(3)如图③,在矩形
中,点
在边
上,
与
关于直线
对称,点
的对称点
在边
上,
为
中点,连接
交
于点
,
,若
,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/bfe5b616-a3dd-4385-9ce5-2f28e9fd849c.png?resizew=337)
(1)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/025a9324effb6fc7af086fbaf59af8d5.png)
[尝试应用]
(2)如图②,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8fc075baea334a8ce2a7a534a5007aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
[拓展提高]
(3)如图③,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/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fd09f591e95fd40e8ecfe6020f9f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b14a0feea287890340c27387aeb39864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9e953a4a5f98c96bbe67cbaadf76d9.png)
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名校
【推荐2】如图1,长方形
的边
在数轴上,
为原点,长方形
的面积为12,
边的长为3.
![](https://img.xkw.com/dksih/QBM/2019/11/13/2332897049575424/2333689742270465/STEM/e1ecee723f904a7baf3c64e78a3ee0ad.png?resizew=507)
(1)数轴上点
表示的数为________.
(2)将长方形
沿数轴水平移动,移动后的长方形记为
,设长方形
移动的距离为
,移动后的长方形
与原长方形
重叠部分的面积记为
.
①当
等于原长方形
面积的
时,则点
的移动距离
_______,此时数轴上点
表示的数为_______.
②
为线段
的中点,点
在线段
上,且
当点
,
所表示的数互为相反数时,则
的值为_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://img.xkw.com/dksih/QBM/2019/11/13/2332897049575424/2333689742270465/STEM/e1ecee723f904a7baf3c64e78a3ee0ad.png?resizew=507)
(1)数轴上点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)将长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4233de56a5741a7628bee5b98a384b05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4233de56a5741a7628bee5b98a384b05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/668e00949d667aeae376db00afe693fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc8396a7120abeaae6236a9292e5b9f8.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ee5b8fc18425ea97a1b93192dd4e42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34b2a957b62825e8f48f9bade9cddb51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0af85a22505637f2699c6bd13feb2a79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】(1)如图①,在平面直角坐标中,已知菱形
的顶点
,点
在
轴上,
,点
在
轴上.
![](https://img.xkw.com/dksih/QBM/2022/7/17/3024375242178560/3030060530360320/STEM/b627d7e9e6544157941b7bdf20f415cf.png?resizew=360)
①求直线
的解析式;
②已知点
在直线
的下方,且
的面积为
,求
的值.
(2)如图②,已知
中,
,
,
,点
为
内一点,且点
到
三边的距离之和为
,直接写出
的最小值是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2022/7/17/3024375242178560/3030060530360320/STEM/b627d7e9e6544157941b7bdf20f415cf.png?resizew=360)
①求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
②已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01367af8fb4084ae1241b2e1612585ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26e59b7c0d4a0b312e674b7bb061240b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)如图②,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1942d949d3ed69953949ad2bc5af8bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba0189bb8b874dd68d1d51055a1a9e00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff37bc21ae8d43a290da3ee72894acc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a563c50a7f6d10fa46339d7107fc85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1942d949d3ed69953949ad2bc5af8bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1942d949d3ed69953949ad2bc5af8bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92cff5cb811cc87656424cab9d37474d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
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【推荐2】如图,以AB为直径的
上有一动点C,
的切线CD交AB的延长线于点D,过点B作
交
于点M,连接AM,OM,BC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/8/b793eb9a-5876-434b-bee9-bd63137f2ec3.png?resizew=154)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795711199020fef2c9afca5d68dd3c7.png)
(2)若
,填空:
①当AM= 时,四边形OCBM为菱形;
②连接MD,过点O作
于点N,若
,则ON= .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b221022f0725ce75f257af109fa5a8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/8/b793eb9a-5876-434b-bee9-bd63137f2ec3.png?resizew=154)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795711199020fef2c9afca5d68dd3c7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9419302c045670b2f7384d6b0e7b7738.png)
①当AM= 时,四边形OCBM为菱形;
②连接MD,过点O作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa7168257ed6188c76d4e64efde5264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa270efb484bc2c8ce33438e17c02754.png)
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【推荐3】如图,菱形ABCD的边长为5 厘米,对角线BD长8厘米.点P从点A出发沿AB方向匀速运动,速度为1厘米秒;点Q从点D 出发沿DB 方向匀速运动,速度为2 厘米/秒:P、Q 同时出发,当点Q与点B重合时,P、Q停止运动,设运动时间为t秒,解答下列问题:
![](https://img.xkw.com/dksih/QBM/2018/3/25/1909976584470528/1916171133042688/STEM/413860a03e4040eba2613979f8e2d4d3.png?resizew=452)
(1)当t为何值时,△PBQ为等腰三角形?
(2)当t为何值时,△PBQ的面积等于菱形ABCD面积的
?
(3)连接AQ,在运动过程中,是否存在某一时刻t,使∠PQA=∠ABD?若存在,请求出t值; 若不存在,请说明理虫:
(4)直线PQ 交线段BC于点M,在运动过程中,是否存在某一时刻t,使BM:CM=2:3?若存在,请求出t值; 若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2018/3/25/1909976584470528/1916171133042688/STEM/413860a03e4040eba2613979f8e2d4d3.png?resizew=452)
(1)当t为何值时,△PBQ为等腰三角形?
(2)当t为何值时,△PBQ的面积等于菱形ABCD面积的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d41840af35e218a5639a2eff4d80b54.png)
(3)连接AQ,在运动过程中,是否存在某一时刻t,使∠PQA=∠ABD?若存在,请求出t值; 若不存在,请说明理虫:
(4)直线PQ 交线段BC于点M,在运动过程中,是否存在某一时刻t,使BM:CM=2:3?若存在,请求出t值; 若不存在,请说明理由.
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【推荐1】在平面直角坐标系xOy中,如果点A、点C为某个菱形的一组对角的顶点,且点A、C在直线y=x上,那么称该菱形为点A、C的“极好菱形”.如图为点A、C的“极好菱形”的一个示意图.已知点M的坐标为(1,1),点P的坐标为(3,3).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/cb516a52-e273-4ff4-a260-89c68334021d.png?resizew=232)
(1)点E(2,4),F(1,3),G(4,0),H(3,2)中,能够成为点M、P的“极好菱形”的顶点的是 ;
(2)如果四边形MNPQ是点M、P的“极好菱形”.
①当点N的坐标为(
,
)时,求四边形MNPQ的面积;
②当四边形MNPQ的面积为12,且与直线y=x+b有公共点时,求出b的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/cb516a52-e273-4ff4-a260-89c68334021d.png?resizew=232)
(1)点E(2,4),F(1,3),G(4,0),H(3,2)中,能够成为点M、P的“极好菱形”的顶点的是 ;
(2)如果四边形MNPQ是点M、P的“极好菱形”.
①当点N的坐标为(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
②当四边形MNPQ的面积为12,且与直线y=x+b有公共点时,求出b的取值范围.
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【推荐2】如图,等腰直角△OAB的斜边OA在坐标轴上,顶点B的坐标为(﹣2,2).点P从点A出发,以每秒1个单位的速度沿x轴向点O运动,点Q从点O同时出发,以相同的速度沿x轴的正方向运动,当点P到达点O时,点P、点Q同时停止运动.连接BP,过P点作∠BPC=45°,射线PC与y轴相交于点C,过点Q作平行于y轴的直线l,连接BC并延长与直线l相交于点D,设点P运动的时间为t(s).
(1)点P的坐标为 (用t表示);
(2)当t为何值,△PBE为等腰三角形?
(3)在点P运动过程中,判断
的值是否发生变化?请说明理由.
(1)点P的坐标为 (用t表示);
(2)当t为何值,△PBE为等腰三角形?
(3)在点P运动过程中,判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/652b7816c6657a09c42fc4c48df7a9ed.png)
![](https://img.xkw.com/dksih/QBM/2019/5/25/2211273433997312/2212590698954752/STEM/f574809708e244bcb6b27a176bf506e6.png?resizew=250)
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【推荐3】如图,直线y=
x+6与x轴、y轴分别交于A,B两点,将直线l1沿着y轴正方向平移一段距离得到直线l2交y轴于点M,且l1与l2之间的距离为3,点C(x,y)是直线11上的一个动点,过点C作AB的垂线CD交y轴于点D.
![](https://img.xkw.com/dksih/QBM/2020/2/3/2390904413650944/2391291508219904/STEM/0a253b320cc046788cfbd87cc1897fa1.png?resizew=448)
(1)求直线l2的解析式;
(2)当C运动到什么位置时,△AOD的面积为21
,求出此时点C的坐标;
(3)连接AM,将△ABM绕着点M旋转得到△A'B'M',在平面内是否存在一点N.使四边形AMA'N为矩形?若存在,求出点N的坐标:若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://img.xkw.com/dksih/QBM/2020/2/3/2390904413650944/2391291508219904/STEM/0a253b320cc046788cfbd87cc1897fa1.png?resizew=448)
(1)求直线l2的解析式;
(2)当C运动到什么位置时,△AOD的面积为21
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(3)连接AM,将△ABM绕着点M旋转得到△A'B'M',在平面内是否存在一点N.使四边形AMA'N为矩形?若存在,求出点N的坐标:若不存在,请说明理由.
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