已知:如图,
,
,
与
相交于点
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276f64bcfa74b44c5ef5ca88fc8208f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3a6dcaf9f9e9a940b4a16f7ec2fc2d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/1/5468cfe3-2aa5-4604-b636-14a03d765fed.png?resizew=183)
更新时间:2023-06-29 22:17:36
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相似题推荐
解答题-证明题
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【推荐1】直角梯形ABCD,∠A=∠B=90°,以腰AB为直径作⊙O,OC平分∠BCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/4d3e2565-5e5a-4c79-b9d6-ff99035f8954.png?resizew=163)
(1)求证:CD与⊙O相切;
(2)若OD=6,OC=8,求阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/4d3e2565-5e5a-4c79-b9d6-ff99035f8954.png?resizew=163)
(1)求证:CD与⊙O相切;
(2)若OD=6,OC=8,求阴影部分的面积.
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【推荐2】如图,已知在△ABC中,AE平分△ABC的外角∠PAC,DE垂直平分BC,分别交BC,AC,AE于点D,F,E,分别过点E作EQ
AP,EH
AC,垂足分别为Q,H.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/3cb8279e-08b9-424f-85b7-9b4f99400554.png?resizew=187)
(1)求证:BQ=CH;
(2)若AQ=4,BQ=12,求AC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/3cb8279e-08b9-424f-85b7-9b4f99400554.png?resizew=187)
(1)求证:BQ=CH;
(2)若AQ=4,BQ=12,求AC的长.
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解答题-问答题
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适中
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【推荐1】【阅读】八年级上册课本第62页有如下内容:如图,在
中,
.作
的平分线
,根据
可证得
,可知
.于是,我们得到如下定理:
有两个角相等的三角形是等腰三角形(简称“等角对等边”).
【应用】请用上述定理解决问题:有两个大小不等的等腰
和
如图放置,
.
(1)如图①,若
,则
和
的位置关系为___________;
(2)如图②,过
上一点O作直线
,分别交
于点G、H、F.若
,
,求线段
的长;
(3)如图③,过
上一点O任意作一条直线
,分别交
于点G、H、F.
①
的平分线和
的平分线交于点 M,
的平分线和
的平分线交于点N,则
与
的度数之和是否为定值?若是,求出这个定值;若不是,请说明理由.
②在①的条件下,作
的平分线交
的反向延长线于点I,设
,
,则
、
有怎样的数量关系?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beb8b968744573e593ac28451c69729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/901d94b32038d99ef9e748f1fe2b8c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
有两个角相等的三角形是等腰三角形(简称“等角对等边”).
【应用】请用上述定理解决问题:有两个大小不等的等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88036f8dc240fcc187b4942ec4f11a1b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/082dcc0a-14cb-40db-98d3-d9f24724d536.png?resizew=141)
(1)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20e6123345ee13a650c3223291123dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/2033abe5-1131-457d-ac0d-77099d98e372.png?resizew=261)
(2)如图②,过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c17b89160163de99bfdc3f2676be5da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c64f1dd57569dc1f75f2df9ab00f088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ea59c477984ddfd71900baca92ab229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1918e436317a82aee6f9c5767a973580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/2b4cb4e3-cc8a-4616-9793-1cf31de9d82d.png?resizew=262)
(3)如图③,过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c64f1dd57569dc1f75f2df9ab00f088.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/264492257f116976f300a0377a1ad957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778d3556c2454a733a15629af5c2444f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c9585047e70dad57e1d0c02c640f63e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29784b19fa797d17854a57ba822b1d9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86bfa0bbe05b01453e6ed15d74da2602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a742abf1b0702125a0c77cbfbef118ca.png)
②在①的条件下,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a53ec3f9aed38a23bab2b1d445cacc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eef1f7b9adab87736321e30949a4d668.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb925776251acea1e4fdb7a01f841c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21288711f946b36d6652d7b7f7583648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/402ad436-6da7-4b7c-b482-b6188d772066.png?resizew=378)
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解答题-证明题
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名校
【推荐2】如图(1),点E是
的中点,
,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/1c6486a4-d920-44ca-8ee8-56080bfa0e0f.png?resizew=273)
(1)
有怎样的数量关系?请说明理由;
(2)若将“
”改为“
”,如图(2)所示,以上结论还成立吗?如果成立,请给出证明;如果不成立,不需要说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d8397018b0a01a1b4e9574604f9e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2892af2a890aca2c02d38a25a4aa6f06.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/1c6486a4-d920-44ca-8ee8-56080bfa0e0f.png?resizew=273)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c7ec257c6cb0d72c7ca79c121c0685c.png)
(2)若将“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d8397018b0a01a1b4e9574604f9e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/190e01d58a7d518dd8e949b40aed8055.png)
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