如图,∠A=36°,∠DBC=36°,∠C=72°,找出图中的一个等腰三角形,并给予证明.
我找的等腰三角形是: .
证明:
我找的等腰三角形是: .
证明:
![](https://img.xkw.com/dksih/QBM/2019/6/14/2225508433133568/2225586010267648/STEM/9489d645324b4dcfbfdfc6e9968643a2.png?resizew=99)
更新时间:2019-06-14 19:49:14
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【知识点】 根据等角对等边证明等腰三角形
相似题推荐
解答题-作图题
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适中
(0.65)
名校
【推荐1】【阅读理解】
课外兴趣小组活动时,老师提出了如下问题:
如图1,
中,若
,
,求
边上的中线
的取值范围.小明在组内经过合作交流,得到了如下的解决方法:延长
到点E,使
,请根据小明的方法思考:
(1)由已知和作图能得到
的理由是 .
A.
B.
C.
D.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5eb2decaa6be2df36a5e4b7fabf585d.png)
(2)求得
的取值范围是 .
A.
B.
C.
D.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142869a7cc5e90b551b38210deff9f0f.png)
(3)【问题解决】
如图2,
是
的中线,
交
于E,交
于F,且
.求证:
.
课外兴趣小组活动时,老师提出了如下问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/dabc8e07-686f-4425-9abd-df2288ebea30.png?resizew=333)
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](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/0ad98ad714864041a632ca949308e417.png)
(1)由已知和作图能得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e101f2ad5cbdb169f866f0ea82f897.png)
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6720e36b02193db161c61d4017673760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a290f047f50481318d040c604d72f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beb8b968744573e593ac28451c69729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5eb2decaa6be2df36a5e4b7fabf585d.png)
(2)求得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f863e3893cda99d0a42b469f9b0438cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145a085312b8fa4af76b85fd7669413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab7f502effec463bec4889245c4f09a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142869a7cc5e90b551b38210deff9f0f.png)
(3)【问题解决】
如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5787c784b686435a2073bdeb836307c.png)
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解答题-证明题
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适中
(0.65)
【推荐2】已知,矩形
中,E是
边上的一个动点,点F、G、H分别是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/93a8b784-e11d-4553-973e-bf4f12c291ef.png?resizew=156)
(1)求证:
.
(2)若
,当四边形
是正方形时,求矩形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f1a4565552f53b9118cfb3e316fd80.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/93a8b784-e11d-4553-973e-bf4f12c291ef.png?resizew=156)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b9ba81f276d0d224e510a82e02c52f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次