勾股定理是平面几何中一个极为重要的定理,世界上各个文明古国都对勾股定理的发现和研究做出过贡献,特别是定理的证明,据说有400余种.如图是希腊著名数学家欧几里得证明这个定理使用的图形.以
的三边
为边分别向外作三个正方形:正方形
、正方形
、正方形
,再作
垂足为G,交
于P,连接
,
.则结论:①
,②
,③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05df49480e6452d594adb61e20bd2422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
,④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c0e1f056fdb9c743fd5fdd9d9904357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
.正确的结论有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/31/ad2e297d-8e20-467b-9e2f-c7c1983436b8.png?resizew=216)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/201e6f7f2e69f2c5545249c5a1d136db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beeedb7ddaac2cd3d37151d058ab7fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613c9d8e210a1d4afb34cc1f64dcdc76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af6b531f532eb39c26d36e9dd97254d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbf52ca8bb449ba5ca50b30376572bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31014da366005410efa2b3c87430aebe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02839e178e16a50ad2e11fad25c4b561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05df49480e6452d594adb61e20bd2422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d57d3de34ff221bbf6d18ae9f72e8943.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c0e1f056fdb9c743fd5fdd9d9904357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b384513c426b20e592d6191a3757a24a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/31/ad2e297d-8e20-467b-9e2f-c7c1983436b8.png?resizew=216)
A.1个 | B.2个 | C.3个 | D.4个 |
22-23八年级下·广西南宁·期中 查看更多[2]
更新时间:2023-08-19 12:25:29
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【推荐1】如图,在正方形
中,点E是
上一点,过点E作
交
于点F,连接
,
,若
,则
的度数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/63ebd0c6-b290-4f1e-8560-d4eaa281a706.png?resizew=106)
![](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/a507bc6dc631fc4b20d31d7acacd151b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a679040c4d556723e482bacbab41356d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7763258c790a48fa4d796e934e416377.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74222ce1667f03a26064f7762038d89.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/63ebd0c6-b290-4f1e-8560-d4eaa281a706.png?resizew=106)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知正方形
的边长为4,点
是平面内的一动点,连接
,且
,点
是
上一点,
,连接
,下列结论错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e694e3836ab29221949ad4a78c9860fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cebae81fc24dd6a2a1926240de0812fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b71389cfddcdad88236a7c230d19ed6.png)
A.![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() |
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【推荐1】如图,四边形ABCD为正方形,O为AC、BD的交点,△DCE为Rt△,∠CED=90°,若OE=2
,CE•DE=5,则正方形ABCD的面积为( )
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985491286056960/3015203081838592/STEM/58790dc74b8b4750b716d5151ed7e857.png?resizew=200)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985491286056960/3015203081838592/STEM/58790dc74b8b4750b716d5151ed7e857.png?resizew=200)
A.5 | B.6 | C.8 | D.12.5 |
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【推荐2】如图,在
中,
,分别以
,
,
为边在
的同一侧作正方形
,
,
,四块阴影部分的面积分别为
,
,
,
.若已知图中阴影部分的面积的和,则一定能求出( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/7ace409a-1747-4d21-825e-ad072ce8de1a.png?resizew=211)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de69fa2b452458ea3a6cda748047e7c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7a0bfc593a8a33b6cade6ba213904c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d7267d1196794bb6754f76b3bd02170.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/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/7ace409a-1747-4d21-825e-ad072ce8de1a.png?resizew=211)
A.正方形![]() | B.正方形![]() |
C.![]() | D.四边形![]() |
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【推荐1】如图1是中国数学会的会徽,,它是由四个相同的直角三角形拼成的一个正方形. 将会徽抽象为图2,记
,
,
. 对图2进行图形运动得到图3,下面的说法不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f56ba6d9a341870c55ebd985992738dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb836a9a51c24bba5cf5211fd5b8841d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c884a45b56bc34d79273b067c1520b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/f9f856a3-8fa2-4f5c-97d0-7e03350609ee.png?resizew=484)
A.![]() ![]() ![]() |
B.![]() ![]() ![]() ![]() |
C.![]() ![]() ![]() |
D.图形运动后,原正方形![]() ![]() ![]() |
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真题
【推荐2】如图,在正方形
中,
是对角线
与
的交点,
是
边上的动点(点
不与
重合),
与
交于点
,连接
.下列五个结论:①
;②
;③
;④
;⑤若
,则
的最小值是
,其中正确结论的个数是 ( )
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/394e1fddb0524407a9df6060bf82eb04.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/54b53c9617b34e20937c9b385685942b.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/ae1181279837454f95b1ad876bd53a76.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/e957eb75eb5f49fcb221d8921d1c07e8.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/91a04958cc134721b95a4bf22f951fae.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/c6e8d92a49ff4b93bcf19300979f9f12.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/91a04958cc134721b95a4bf22f951fae.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/207008faf55f4b61a064f4a0ba97ebc1.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/ae71257660974e67baba89207b5009cf.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/975dfe2af7cc4fe6b4873e85961547f1.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/4d5b41d1e6474582909a2ce442904a1c.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/a98ca5c22d4b4004b4d32bdba8220203.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/70368eb3474c41b99fd40639a62a0406.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/9c80bc7b8e22496b8024e447b041cd85.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/3228d04fb54d41a2b17ba8f00aa64c56.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/4298f634386e440a82576878840a731e.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/c4068e33a7e747a5bf80694f6022fd97.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/2c942c41a16447d38371601801a24b86.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647334912/STEM/ed08f6280f8f44879580027c3b733307.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/4/18f60ad6-c043-415c-b3ed-7ed4eca4ace8.png?resizew=156)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐1】在正方形ABCD中,点E为BC边的中点,把△ABE沿直线AE折叠,B点落在点B′处,B′B与AE交于点F,连接AB′,DB′,FC.下列结论:①AB′=AD;②△FCB′为等腰直角三角形;③∠CB′D=135°;④BB′=BC;⑤
.其中正确的个数为( ).
![](https://img.xkw.com/dksih/QBM/2017/6/2/1700294083895296/1700823560142848/STEM/369a94de3d3649d882f5f75605cefb4f.png?resizew=126)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99f86fc43ae4e3d0cbb208dd41d4a45.png)
![](https://img.xkw.com/dksih/QBM/2017/6/2/1700294083895296/1700823560142848/STEM/369a94de3d3649d882f5f75605cefb4f.png?resizew=126)
A.2 | B.3 | C.4 | D.5 |
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【推荐2】如图,已知E是正方形
中
边延长线上一点,且
,连接
与
交于点N,F是
的中点,连接
交
于点M,连接
.有如下结论:①
;②
;③
④
,其中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/a91eaf9d-0ce1-4ed4-8152-b894172798e3.png?resizew=178)
![](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/e3d2d3643a9579f2c693ef86909441e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79bfa822af47cba942900e4cba1c0381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0fc7eed80f5d659e4bcecae5bb9327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a568c54119b818a81c4cc5024ec4ea2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f78b27507236b1d0fb4814733147452f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cae49d14efd851b925841eb04b296bd0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/a91eaf9d-0ce1-4ed4-8152-b894172798e3.png?resizew=178)
A.①②③ | B.①②④ | C.②③④ | D.①②③④ |
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