如图,
分别切⊙O于A、B,
,
半径为2,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db2f1723ea3f98bfa1a96c5a692c20f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b15b82151bff7cc0238d2034a6129f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
A.3 | B.4 | C.![]() | D.![]() |
更新时间:2024-05-17 14:24:21
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【推荐1】如图,在
中,
,
,
与
,
分别切于点D,C,连接
.则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/040014a609bb4c2c2f16f223467e4871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
A.50 | B.40 | C.30 | D.20 |
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【推荐2】如图,
是
的切线,
为切点,
经过圆心
,若
,则
的长度是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/6639f7a4-9ed8-4464-beb2-ab403fc49d9b.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3355e2fa0ac6c675f02ee36c3ced4f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e9b78f01fb861d4bc8ea140d6c98931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e19b77c15bdff64b03a92cac5e7598eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/6639f7a4-9ed8-4464-beb2-ab403fc49d9b.png?resizew=160)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,将矩形
沿对角线
折叠,点
的对应点为点
,
与
相交于点
,若
,
,则
的长度是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b6ac229474c3f3d9548ec57a1f7ed97.png)
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A.1 | B.2 | C.![]() | D.3 |
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【推荐2】如图,某校初三学生数学综合实践活动小组的同学欲测量校园内一棵雪松树DE的高度,他们在这棵树正前方的台阶上的点A处测得树顶端D的仰角为27°,再到台阶下的点B处测得树顶端D的仰角为56°,已知台阶A点的高度AC为2米,台阶AB的坡度i=1:2,则大树DE的高度约为( )(参考数据:sin27°≈0.45,tan27°≈0.5,sin56°≈0.83,tan56°≈1.5)
![](https://img.xkw.com/dksih/QBM/2020/3/5/2412905963667456/2413095425802240/STEM/901c5adf09d34b58bf6844dd6ea7994f.png?resizew=169)
![](https://img.xkw.com/dksih/QBM/2020/3/5/2412905963667456/2413095425802240/STEM/901c5adf09d34b58bf6844dd6ea7994f.png?resizew=169)
A.5米 | B.6米 | C.7米 | D.8米 |
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