如图,点
,
,
,
在同一条直线上,
与
交于点
,已知
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/12/30/3141833923125248/3158500561756160/STEM/25cb814961d74d9bb8d678574dedd057.png?resizew=262)
(1)求证:
;
(2)若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47a70a2811c174e73ce1beeb80c75c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b5b44e9441f7bdf8d0a770ab1231f4.png)
![](https://img.xkw.com/dksih/QBM/2022/12/30/3141833923125248/3158500561756160/STEM/25cb814961d74d9bb8d678574dedd057.png?resizew=262)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de5e949d83885c130998ef12f95da4cd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a17a1581fd60305477f6bd4541d85c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
更新时间:2023-01-22 21:28:45
|
相似题推荐
解答题-问答题
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【推荐1】如图1,在△ABC中,BE是角平分线,AD⊥BC于点D,BE与AD相交于点F,∠ABC=60°.
(1)求∠AFB的度数;
(2)如图2,AG是△ABC的角平分线,若∠DAG=6°,求∠C的度数.
(1)求∠AFB的度数;
(2)如图2,AG是△ABC的角平分线,若∠DAG=6°,求∠C的度数.
![](https://img.xkw.com/dksih/QBM/2021/9/9/2804606213324800/2805351174619136/STEM/a65dd5a9-9335-43cd-a750-99257d76caa9.png?resizew=458)
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【推荐2】如图1,已知
为直角三角形,
,在
的延长线上取一点
,使得
,点
是
的中点,连接
,
为
的中点,连接
、
.
(1)试判断
与
的位置关系,并说明理由;
(2)若
,请求出
的度数;
(3)如果将题中“在
的延长线上取一点
”改为“在
的延长线上取一点
”,其余条件不变.如图2所示,若
,请求出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3cc9cccfb4c260dac05f4ed57e8c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/118c6fe2-159c-4d5d-88ff-61a4832d2a2e.png?resizew=274)
(1)试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca4b6a112fcf24ff63571aba262191e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(3)如果将题中“在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b117e719fd0b72974722720a006cf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
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解答题-证明题
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【推荐1】教材呈现:如图是华师版八年级上册数学教材第94页的部分内容.
请根据所给教材内容,结合图①,写出“线段垂直平分线的性质定理”完整的证明过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/875f570a-a6ce-4aff-8e32-73beb1b9c1a2.png?resizew=461)
定理应用:
(1)如图②,在
中,
、
的垂直平分线分别交
于点
、
,垂足分别为
,
,
,则
的周长为__________.
(2)如图③,在
中,
,
,
、
分别是
、
上任意一点,若
,
的面积为
,则
的最小值是__________.
2.线段垂直平分线 我们已经知道线段是轴对称图形,线段的垂直平分线是线段的对称轴,如图,直线 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 线段垂直平分线的性质定理线段垂直平分线上的点到线段两端的距离相等. 已知:如图, ![]() ![]() ![]() ![]() ![]() 求证: ![]() ![]() 分析:图中有两个直角三角形 ![]() ![]() ![]() 请写出完整的证明过程. |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/875f570a-a6ce-4aff-8e32-73beb1b9c1a2.png?resizew=461)
定理应用:
(1)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b8a4b0e72a4de1da975168b243a325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(2)如图③,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/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb41f8ded9116e83f87a8e43b0ce7f8.png)
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【推荐2】已知△ABC与△CDE都是等腰直角三角形,∠ACB=90°,∠DCE=90°,连结BE,AD,相交于点F.求证:
![](https://img.xkw.com/dksih/QBM/2019/10/11/2309685914378240/2313657935962112/STEM/6e58978b212b4596b7e9824c76daeb3d.png?resizew=192)
(1)AD=BE;
(2)AD⊥BE.
![](https://img.xkw.com/dksih/QBM/2019/10/11/2309685914378240/2313657935962112/STEM/6e58978b212b4596b7e9824c76daeb3d.png?resizew=192)
(1)AD=BE;
(2)AD⊥BE.
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