如图,在
中,
,
平分
,交
于点
,过点
作
于点
.
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a636611a8e4f2fa6256fa921a5158b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b44fa421d3ab01eee0d360a503bd212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971b23e3ee827018557d6c88edd5369a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20e5d585fbf903ee5affa6d083ab95f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e444dcae3fe7c0975428ee76728599.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3ee061bc43b327214ea7981a25137c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fb128c8247365e3d83d701c773b2a0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
23-24八年级下·湖南永州·期中 查看更多[2]
湖南省永州市京华中学2023-2024学年八年级下学期期中数学试题(已下线)专题01 直角三角形(8大题型+优选提升题)-备战2023-2024学年八年级数学下学期期末真题分类汇编(湖南专用)
更新时间:2024-05-17 00:28:13
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相似题推荐
解答题-作图题
|
适中
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【推荐1】本学期我们学习了角平分线的性质定理及其逆定理,那么,你是否还记得它们的具体内容.
(1)请把下面两个定理所缺的内容补充完整:
角平分线的性质定理:角平分线上的点到______的距离相等.
角平分线性质定理的逆定理:到角的两边距离相等的点在______.
(2)老师在黑板上画出了图形,把逆定理的已知、求证写在了黑板上,可是有些内容不完整,请你把内容补充完整.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/da1639ae-7b19-4a5b-9165-f86699f7f1f9.png?resizew=587)
(3)请你完成证明过程
(4)知识运用:如图,三条公路两两相交,现在要修建一个加油站,使加油站到三条公路的距离相等,加油站可选择的位置共有______处.
(1)请把下面两个定理所缺的内容补充完整:
角平分线的性质定理:角平分线上的点到______的距离相等.
角平分线性质定理的逆定理:到角的两边距离相等的点在______.
(2)老师在黑板上画出了图形,把逆定理的已知、求证写在了黑板上,可是有些内容不完整,请你把内容补充完整.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/da1639ae-7b19-4a5b-9165-f86699f7f1f9.png?resizew=587)
(3)请你完成证明过程
(4)知识运用:如图,三条公路两两相交,现在要修建一个加油站,使加油站到三条公路的距离相等,加油站可选择的位置共有______处.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/a269da0c-f9ce-4895-84a3-0e7b0fb820ce.png?resizew=217)
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解答题-问答题
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【推荐2】如图1,已知
,
,
与
交于点
.
(1)求
的度数;
(2)如图2,连接
,在不添加辅助线的情况下,请直接写出图中所有全等三角形(不包括已知全等三角形)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab8b101eff311b7a6a56b9587972b7a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21c2425db34d83dbe44f3ee3d2c5439b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/20/b07b5273-8e6c-41d6-bb8d-cd73eb2a5c46.png?resizew=338)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af38f27e6456fdba3497e66db2a6608f.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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解答题-问答题
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【推荐1】如图,
,
的平分线与
的外角平分线交于点
,过点
作
于
.
(1)如图1,若
,求
的度数.
(2)如图2,连
,求证:
平分
.
(3)如图3,若
周长为20,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf468f5132e14ee1d8cc766808b11af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/074edc51-fdba-4515-b2fd-c47f882caf78.png?resizew=431)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72ebf11c2d7466ef937bbff2899f5c86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
(2)如图2,连
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bab53e0cb6e6ec13764e326b98f26b6.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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解答题-证明题
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名校
【推荐2】在△ABC中,若AD是∠BAC的角平分线,点E和点F分别在AB和AC上,且DE⊥AB,垂足为E,DF⊥AC,垂足为F(如图(1)),则可以得到以下两个结论:
①∠AED+∠AFD=180°;②DE=DF.
那么在△ABC中,仍然有条件“AD是∠BAC的角平分线,点E和点F,分别在AB和AC上”,请探究以下两个问题:
(1)若∠AED+∠AFD=180°(如图(2)),则DE与DF是否仍相等?若仍相等,请证明;否则请举出反例.
(2)若DE=DF,则∠AED+∠AFD=180°是否成立?(只写出结论,不证明)
①∠AED+∠AFD=180°;②DE=DF.
那么在△ABC中,仍然有条件“AD是∠BAC的角平分线,点E和点F,分别在AB和AC上”,请探究以下两个问题:
(1)若∠AED+∠AFD=180°(如图(2)),则DE与DF是否仍相等?若仍相等,请证明;否则请举出反例.
(2)若DE=DF,则∠AED+∠AFD=180°是否成立?(只写出结论,不证明)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/aacbf2a9-e247-4f35-9944-9c636654d50e.png?resizew=284)
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解答题-证明题
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【推荐1】在正方形ABCD中,点E是射线BC上的点,直线AF与直线AB关于直线AE对称,直线AF交射线CD于点F.
(1)如图①,当点E是线段BC的中点时,求证:AF=AB+CF;
(2)如图②,当∠BAE=30°时,求证:AF=2AB﹣2CF;
(3)如图③,当∠BAE=60°时,(2)中的结论是否还成立?若不成立,请判断AF与AB、CF之间的数量关系,并加以证明.
(1)如图①,当点E是线段BC的中点时,求证:AF=AB+CF;
(2)如图②,当∠BAE=30°时,求证:AF=2AB﹣2CF;
(3)如图③,当∠BAE=60°时,(2)中的结论是否还成立?若不成立,请判断AF与AB、CF之间的数量关系,并加以证明.
![](https://img.xkw.com/dksih/QBM/2020/6/7/2479490899058688/2480205429563392/STEM/10322dde63d644ccab166e5db8eff167.png?resizew=397)
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解答题-证明题
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【推荐2】在ABC中,AB=AC,∠BAC=120°,AD⊥AC于点A,(1)求∠BAD的度数; (2)证明:DC=2BD.
![](https://img.xkw.com/dksih/QBM/2011/11/22/1573288730263552/1573288753700864/STEM/002228d9b02d422eac4cdfe9cd46a580.png?resizew=164)
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解答题-证明题
|
适中
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【推荐1】已知矩形
中,点
为
上一点.连接
、
,
的平分线与
交于点
,
垂直平分
,连接
.
(1)如图1,
①求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370abdf35cb8817d35b78eea892731ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9c59463fdce9259f60b935164dd00e.png)
;
②若
,
,求
的面积;
(2)如图2,若
,
是
的中点,连接
,判断四边形
的形状,并证明.
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
(1)如图1,
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370abdf35cb8817d35b78eea892731ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9c59463fdce9259f60b935164dd00e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f979d5406af7e951f386dbb55a9617eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b61601ecf8de47ed9b84ee59d65f8118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6697f92f42bf3ded6b5a13dd703fe032.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf26ce298c75a551d337346674aea970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0db8aa37b6e877dcf19342e245d4fbe.png)
![](https://img.xkw.com/dksih/QBM/2021/7/2/2755492956545024/2773992882053120/STEM/ead7ce74-8476-4340-b7bc-d890aacbdc60.png)
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解答题-问答题
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【推荐2】如图,菱形
的两条对角线
,
相交于点O,若
,
,求菱形
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a99044cdedf9e67bffd16a7eeeadf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/05b31fd4-6bd9-4b47-bf91-99a8e6f8289f.png?resizew=248)
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解答题-问答题
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【推荐3】【问题提出】
(1)如图1,
的弦
与
相交于点P,连接
、
,若
,
,则
的度数为______°;
(2)如图2,已知正方形
的边长为8,点E为边
上一点,连接
,过
的中点O作
于点F,若
,求
的长;
【问题解决】
(3)如图3,正方形
是某森林景区示意图,为安全起见,工作人员计划在边
上找一点E,对角线
上找一点F(点E、F均不与端点重合),将
的中点O处设为救援中心,沿
修建两条紧急救援通道,并在
这两条小路上安排安保人员巡逻.根据规划要求,
,为了合理安排巡逻人数,需要知道
与
之间的数量关系,请你求出
与
之间的数量关系.
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e101c42e01349a63084529660528e27e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1259a08a666205cd08c53eb8d76287dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(2)如图2,已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f4a6920a0dc269d5d1781e87fe84f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bba9aff2a96c299557ee488d3e66a76c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
【问题解决】
(3)如图3,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5d975f0364c57e4f19617e066bf1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b075e73896d0bb82e6c0a06bdfb2046e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bba9aff2a96c299557ee488d3e66a76c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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