如图,在平行四边形
中,连接
,在
的延长线上取一点
,在
的延长线上取一点
,使
,连接
,
,求证:
.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03687d97d61b4a7cecbb73f2a6604212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f11b25c9e7dbecf0881bd4e86c60f2a7.png)
![](https://img.xkw.com/dksih/QBM/2016/8/16/1574230160826368/1574230167363584/STEM/524c1bdd2b604cf4a2cc7e2573336cf6.png?resizew=186)
更新时间:2017-08-26 12:11:12
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解答题-证明题
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【推荐1】有一块直角三角形纸片,两直角边AC = 6cm,BC = 8cm.
①如图1,现将纸片沿直线AD折叠,使直角边AC落在斜边AB上,则CD =_________cm.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/68f5ce50-3d96-4d21-bfc2-6c12173cc70c.png?resizew=154)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/7533083b-ca10-46af-a403-4cbc7c4306aa.png?resizew=170)
②如图2,若将直角∠C沿MN折叠,点C与AB中点H重合,点M、N分别在AC、BC上,则
、
与
之间有怎样的数量关系?并证明你的结论.
①如图1,现将纸片沿直线AD折叠,使直角边AC落在斜边AB上,则CD =_________cm.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/68f5ce50-3d96-4d21-bfc2-6c12173cc70c.png?resizew=154)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/7533083b-ca10-46af-a403-4cbc7c4306aa.png?resizew=170)
②如图2,若将直角∠C沿MN折叠,点C与AB中点H重合,点M、N分别在AC、BC上,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cee5dc332780d6324ab2290302d0e92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1e777f48f20499953e7df5e24ed111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8374f330b36430f8228f901b4497c45e.png)
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解答题-证明题
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【推荐2】如图,四边形
是正方形,点E为
内一点,将
绕点B顺时针旋转
得到
,连接
、
、
,
与
交于点G.
;
(2)若
,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f09fbb7c29a1b729704c475f977ffb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a8e30f70325b5b14851b9377107ab8.png)
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【推荐1】如图,在▱ABCD中,E是BC的中点,连接AE并延长交DC的延长线于点F.
(2)连接DE,若AD=2AB,求证:DE⊥AF.
(2)连接DE,若AD=2AB,求证:DE⊥AF.
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【推荐2】在学习平行四边形时,刘老师给同学们提了这样一个问题:如图,在▱
中,点
是边
上一点,试证明
的面积等于▱
的一半,小明的思路是过点
作
的平行线,转化为证三角形全等解决问题.
请根据小明的思路完成下面作图和解答:
证明:用直尺和圆规,完成基本作图:过点
作
,交
于点
(只保留作图痕迹).
,
______①,
______②,
四边形
是平行四边形,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
,
______③,
______④,
,(______⑤)
同理可得______⑥,
.
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](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://img.xkw.com/dksih/QBM/editorImg/2023/8/6/03827cc7-82a1-4564-8309-d66b72612140.png?resizew=268)
请根据小明的思路完成下面作图和解答:
证明:用直尺和圆规,完成基本作图:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c9b3785fcd6ab6d6415593965822976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7262afc863940edd427b92f055ccf9c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42b18711de6530d63b2e15d5d6639335.png)
同理可得______⑥,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5065dea74f65483149c814e48b50a7be.png)
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