如图,
都是圆O的弦,
,垂足分别为M、N,如果
,那么
( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5c8d813e31b4fbffa09ae4668f2167.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3bce6cb2f5a8fe63ae9d0927f775f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/140e540849151c98a71e423aa443b39e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/16/571724ed-2df5-4682-be64-7d8541ba56b0.png?resizew=124)
A.4 | B.5 | C.6 | D.![]() |
更新时间:2016-12-12 15:59:54
|
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【推荐1】如图,平行四边形
中,E是边AB的中点,F是对角线BD的中点,若
,则BC=( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/055fad30-1685-44e0-8c0c-16f5f37d1113.png?resizew=164)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1496042c1d721cffd25053e997a9a97.png)
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A.4.5 | B.5 | C.5.5 | D.6 |
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【推荐2】如图,
是
的中线,
、
分别是
、
的中点,连接
.若
,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
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A.6 | B.3 | C.5 | D.4 |
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【推荐1】如图,
为
的直径,弦
于
,且点
为半径
的中点,连接
,则
的度数为( )
![](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/786080c82db1e1d3ec6367397aa63220.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,点A,B,C,D都在半径为3的⊙O上,若OA⊥BC,∠CDA=30°,则弦BC的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/71904e34-67a3-41cc-bba0-323df4ad2e7a.png?resizew=116)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/71904e34-67a3-41cc-bba0-323df4ad2e7a.png?resizew=116)
A.![]() | B.3![]() | C.3 | D.2![]() |
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