题型:解答题
难度:0.65
引用次数:506
题号:17875559
如图,
是
的平分线,
是
的平分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/2ce2e6c3-899b-422a-9240-28a5f925826c.png?resizew=367)
(1)如图1,当
是直角,
时,求
的度数是多少?
(2)如图2,当
,
时,尝试发现
与
的数量关系.
(3)如图3,当
,
时,猜想:
与
、
有数量关系吗?直接写出结论即可.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/2ce2e6c3-899b-422a-9240-28a5f925826c.png?resizew=367)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c36c0d4e38748fbb4a6cf5e700e5e874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eec6ce73c6786d50028addff089bbb64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c36c0d4e38748fbb4a6cf5e700e5e874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eec6ce73c6786d50028addff089bbb64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105d32598bd68a883f8895c42f3da96c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
更新时间:2023-01-13 19:03:34
|
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解答题-问答题
|
适中
(0.65)
【推荐1】将一副三角板的两个锐角顶点重合,
,
,
、
分别是
、
的平分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/bd40a766-9b67-459e-a0bb-73a8e71299e8.png?resizew=376)
(1)如图1,当
与
重合时,则
的大小为___________;
(2)当
绕着点O旋转至如图2所示,且
时,求
的度数;
(3)当
绕着点O旋转至如图3所示,且
时,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5784ea22dbd90af6cdceae43f80a22e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a327b3c7ec05a5da39530fd3b34379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/bd40a766-9b67-459e-a0bb-73a8e71299e8.png?resizew=376)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25aff6459b42a3451cacd41f0200ecb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64336219e6cfb37e6ddbb08bfa75cdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图1,
,点
位于
,
之间,
为钝角,
,垂足为点
.
,则
______;
(2)如图2,过点
作
,交
的延长线于点
,求证:
;
(3)如图3,在(2)间的条件下,
平分
交
于点
,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039237a985c7e47195393a1881b32673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d73b2448f9aba5ca9885fd1edd1bca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735bd70c2fa2bf51fd7aa448b20d0be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b847934372c594ef89f230b1461c879.png)
(2)如图2,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e46ba5224d2f60ef6938717a4c48ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb138968e1bcbcd84e4dda73e0da7c8.png)
(3)如图3,在(2)间的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142544a6d4e6851096afbd3cbad2fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a63861b5c1c110e3599867934187c2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beda2518cf76da94d7ec9a813dcfa82.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】教材第56页拓广探索12题:
中,
是它的角平分线
①求证:
;
②另一方面,我们进一步探索,可以证明
.
请你选择上述两结论中的其中一个进行证明;
(2)由(1)的探索我们可以得到关于
的角平分线
的一个性质,请你总结这个性质(结合图1表述);
(3)运用你所得到的结论完成下列证明:如图2,
是
的平分线,
交
的延长线于点
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f8ad0850ec5c1f217f8f24ea77e7e71.png)
②另一方面,我们进一步探索,可以证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c2151c7435a7d34cc5baac546e077a.png)
请你选择上述两结论中的其中一个进行证明;
(2)由(1)的探索我们可以得到关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)运用你所得到的结论完成下列证明:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b772f3670080e6146b56d2b5673efec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99e0a230f5c4c4eb4ed99339b9f9b80e.png)
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名校
【推荐2】(1)如图1,已知AB∥CD,求证:∠EGF=∠AEG+∠CFG
(2)如图2,已知AB∥CD,∠AEF与∠CFE的平分线交于点G.猜想∠G的度数.证明你的猜想
(3)如图3,已知AB∥CD,EG平分∠AEH,EH平分∠GEF,FH平分∠CFG,FG平分∠HFE,∠G=95°,求∠H的度数.
(2)如图2,已知AB∥CD,∠AEF与∠CFE的平分线交于点G.猜想∠G的度数.证明你的猜想
(3)如图3,已知AB∥CD,EG平分∠AEH,EH平分∠GEF,FH平分∠CFG,FG平分∠HFE,∠G=95°,求∠H的度数.
![](https://img.xkw.com/dksih/QBM/2019/7/20/2251087638839296/2282097007804416/STEM/1146c609692e4dc7801787dc471f4169.png?resizew=549)
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