如图,
是半
的直径,点C是
的中点,点D为
的中点,连接
,
于点E.若
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/bf2b30a1-bb05-4bf1-89b7-3cfb15049db0.png?resizew=146)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/bf2b30a1-bb05-4bf1-89b7-3cfb15049db0.png?resizew=146)
A.3 | B.![]() | C.![]() | D.![]() |
更新时间:2024-01-04 10:23:05
|
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【推荐1】如图,已知AD为
的高线,
,以AB为底边作等腰
,连接ED,EC延长CE交AD于F点,下列结论:①
;②
;③
;④
为等腰三角形;⑤
,其中正确的有( )
![](https://img.xkw.com/dksih/QBM/2020/11/14/2599070356766720/2630989025558528/STEM/d310422b-efaf-4e85-b24f-c0978e1ab36d.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1a3b94566843e92ce775ff6bdf386fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5891d4bebb1260f3ad7751103e4cf33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc5653b8818c02e71dc54027b175256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ba518b984fe745945b946902ce0086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b252808ecdf2a5e818570b789c374348.png)
![](https://img.xkw.com/dksih/QBM/2020/11/14/2599070356766720/2630989025558528/STEM/d310422b-efaf-4e85-b24f-c0978e1ab36d.png?resizew=148)
A.①③⑤ | B.①②④ | C.①③④ | D.①②③⑤ |
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【推荐2】如图,已知
,
,
的垂直平分线
交
于
,交
于
,则以下结论不正确的是( )
![](https://img.xkw.com/dksih/QBM/2019/10/16/2313166006042624/2316977372864512/STEM/70f594d0f67f4547ad93c35ecbd96257.png?resizew=161)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2019/10/16/2313166006042624/2316977372864512/STEM/70f594d0f67f4547ad93c35ecbd96257.png?resizew=161)
A.![]() | B.![]() ![]() |
C.![]() | D.射线![]() ![]() |
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【推荐1】如图,在
中,
,
,
.
是
边上一点,
.以
为直径作
,
的延长线交
于点
,连结
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/1a2d4283-ce30-476d-973f-7b5f01d56a3a.png?resizew=152)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/1a2d4283-ce30-476d-973f-7b5f01d56a3a.png?resizew=152)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,直角三角板
中,
,
,
,将三角板绕点
顺时针旋转60°,得到
,连接
,则
的长是()
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/856d6033-f399-4b57-b9cb-72e6cb0cdac6.png?resizew=211)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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名校
【推荐1】如图,AB是半圆O的弦,DE是直径,过点B的切线BC与⊙O相切于点B,与DE的延长线交于点C,连接BD,若四边形OABC为平行四边形,则∠BDC的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/cf495bdf-2738-49a9-b21f-6df92978d982.png?resizew=216)
A.20.5° | B.22.5° | C.24° | D.30° |
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【推荐2】如图,一块直角三角板ABC的斜边AB与量角器的直径恰好重合,点D对应的刻度是60°,则∠ACD的度数为( )
![](https://img.xkw.com/dksih/QBM/2019/9/16/2291991388995584/2292794614349824/STEM/a4cf4b4181fc4d68aa1325217b42b297.png?resizew=154)
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A.60° | B.30° | C.120° | D.45° |
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