如图,
为
的直径,C是
上一点,D在
的延长线上,且
.
![](https://img.xkw.com/dksih/QBM/2023/2/3/3167024296878080/3167654101106688/STEM/08363e05587b4e03b8585db92f2bb06d.png?resizew=184)
(1)
与
相切吗?如果相切,请你加以证明;如果不相切,请说明理由.
(2)若
与
相切,且
,求
的半径.
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a500d86a97c021f914855cc825efd110.png)
![](https://img.xkw.com/dksih/QBM/2023/2/3/3167024296878080/3167654101106688/STEM/08363e05587b4e03b8585db92f2bb06d.png?resizew=184)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29ab71b06a2cb4d944dd12c84e216322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
更新时间:2023-02-04 19:51:40
|
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【推荐1】如图,为了测量山坡上一根电线杆
的高度,小李在点A处利用测角仪测得电线杆顶P的仰角为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe82457b26bc0282d97107570204d3e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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【推荐2】如图,四边形
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;
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![](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/d40b319212a7e7528b053e1c7097e966.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55b6ce55e67f6e95e616eaf1ca3f6f8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1157dfe4ca7408b2da3736b61ea36185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd4f842ac8b551fb3b3ceff55df43b9.png)
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【推荐1】如图,
是
的直径,
是
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的切线与
的延长线交于点D.若
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.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,△ABC是等边三角形,AB=4,以AB为直径作
,交BC边于点D,交AC边于点F,DE与
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围成的阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-证明题
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【推荐1】如图,在△ABE中,AB=AE,以AB为直径作⊙O,与边BE交于点C,过点C作CD⊥AE,垂足为D.
(1)求证:CD是⊙O的切线;
(2)若AB=10,BC=6,求CD的长.
(1)求证:CD是⊙O的切线;
(2)若AB=10,BC=6,求CD的长.
![](https://img.xkw.com/dksih/QBM/2021/12/4/2865063935008768/2871494893068288/STEM/f933be94-91cf-414b-a5a8-5ede40132514.png?resizew=137)
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【推荐2】如图,
是
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