如图,
是
的直径,
是
的切线,连接
交
于点
,连接
,
.若
,
,则
的长为( )
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e790633cd1586a4f4db097c915280689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
A.![]() | B.1 | C.![]() | D.![]() |
更新时间:2024-05-12 18:59:38
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【推荐1】如图,在
中,
是直径,
,点C是圆上的一动点(不与点A重合),则
的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/18/f710fa57-fe8c-4a3f-aa64-3cf2737cdd80.png?resizew=123)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7440d3b8d1a61d30514e0195c3458b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/18/f710fa57-fe8c-4a3f-aa64-3cf2737cdd80.png?resizew=123)
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
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【推荐2】如图,在以AB为直径的半圆O中,C是它的中点,若AC=2,则△ABC的面积是( )
![](https://img.xkw.com/dksih/QBM/2017/12/27/1847514332561408/1851190048718848/STEM/8c9890390e9e460d8cf752ed242c0671.png?resizew=153)
![](https://img.xkw.com/dksih/QBM/2017/12/27/1847514332561408/1851190048718848/STEM/8c9890390e9e460d8cf752ed242c0671.png?resizew=153)
A.1.5 | B.2 | C.3 | D.4 |
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【推荐1】当“神舟”飞船完成变轨后,就在离地球表面400 km的圆形轨道上运行,如图,当飞船运行到地球表面上P点的正上方的A处时,从飞船上能直接看到的地球上最远的点与P点相距( )
(地球半径约为6 400 km,π≈3,sin 20°≈0.34,cos 20°≈0.94,tan 20°≈0.36,结果保留整数).
![](https://img.xkw.com/dksih/QBM/2019/3/9/2156980536778752/2158973445251072/STEM/b16262c8ebe1418ca7d3a8765ebc3b47.png?resizew=185)
(地球半径约为6 400 km,π≈3,sin 20°≈0.34,cos 20°≈0.94,tan 20°≈0.36,结果保留整数).
![](https://img.xkw.com/dksih/QBM/2019/3/9/2156980536778752/2158973445251072/STEM/b16262c8ebe1418ca7d3a8765ebc3b47.png?resizew=185)
A.2 133 km | B.2 217 km | C.2 298 km | D.7 467 km |
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【推荐2】如图,点A、B、C在⊙O上,过点C作⊙O的切线与OA的延长线交于点D,若
,则
的大小为( )
![](https://img.xkw.com/dksih/QBM/2019/1/17/2120825017982976/2122195337043969/STEM/727a7c16e6654166b2774e0cc1f710f5.png?resizew=156)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45c1c8af31b57ba54ae198658053acff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://img.xkw.com/dksih/QBM/2019/1/17/2120825017982976/2122195337043969/STEM/727a7c16e6654166b2774e0cc1f710f5.png?resizew=156)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】由四个全等的直角三角形和一个小正方形组成的大正方形
如图所示,连接
并延长交
于点
,延长
交
于点
.若
,则
与
的比值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/42d94821-ec1e-4ae1-97f7-6c6fc929258f.png?resizew=149)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f7b9fec96485ab429b245fd3e725bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/42d94821-ec1e-4ae1-97f7-6c6fc929258f.png?resizew=149)
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【推荐2】如图,把
放置在平面直角坐标系中,
,已知点
是
轴上的定点,点
的坐标为
.将
绕点
逆时针旋转
,旋转后点
恰好与点
重合,则旋转前点
的坐标是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
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