1 . 探究用尺规作
的内接正三角形.第一步,在
上取一点A,以A为圆心,
为半径作弧,交
于B,C两点;第二步,连结
并延长交
于点D.
(1)求
的度数;
(2)求证:
.
![](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/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/14/872e48a0-9b2a-429c-a74d-35975a6a9970.png?resizew=157)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb67f27bcda7681b19239a199b4c4d1.png)
您最近一年使用:0次
2 . 在边长为6的正方形
中,E是
上的一个动点(不与点B、C重合),连接
.现将
沿
折叠,使点B落在点F处,连结
并延长交
于点H,交
于点P.
(1)如图,求证:
;
(2)如图,延长
交
的延长线于点Q.
①求证:
;
②若
,求出线段
的长,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.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/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)如图,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80a07022d0abce0541cbfe71ec2f5e4c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/30/31bd6498-7421-422b-abbe-d8319f7f6a3c.png?resizew=138)
(2)如图,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/30/763b313d-fdf2-4f93-a5ad-2d95c5547daa.png?resizew=156)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31d8fc94a10de56f0a8de75fa0bc984.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa12e62b31e4d483e097598aef8bafe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
您最近一年使用:0次
2023-08-29更新
|
192次组卷
|
3卷引用:浙江省嘉兴市平湖市2022-2023学年八年级下学期期末数学试题
名校
3 . 如图1,在正方形纸片
中,点E是
的中点.将
沿
折叠,使点A落在点F处,连结
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/f3005da0-bfa4-435e-845c-74e786591027.png?resizew=495)
(1)求证:
.
(2)如图2,延长
交
于点G,求
的值.
(3)如图3,将
沿
折叠,此时点C的对应点H恰好落在
上.若记
和
重叠部分的面积为
,正方形
的面积为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/f3005da0-bfa4-435e-845c-74e786591027.png?resizew=495)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2cab9d4531e1963402a8cbb61bfe07c.png)
(2)如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc1db5e48db4c59fcdda8812c0431a3.png)
(3)如图3,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcaecf08a22124a457128fb04c9c02bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/978a7a0baaa1a4e7cdac80a6a91a0ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
您最近一年使用:0次
2023-04-23更新
|
495次组卷
|
3卷引用:2023年浙江省嘉兴市南湖区中考一模数学试题