如图,AB是⊙O的直径,∠ACD=25°,求∠BAD的度数.
![](https://img.xkw.com/dksih/QBM/2018/12/27/2105975373275136/2108520857985024/STEM/24759b6522c04ac695d8e01ad5f7bace.png?resizew=124)
17-18九年级下·全国·单元测试 查看更多[8]
更新时间:2018-12-31 10:19:34
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【知识点】 半圆(直径)所对的圆周角是直角解读
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【推荐1】如图,在△ABC中,AB=AC,以AB为直径的⊙O交BC于点D,过点D作DE⊥AC于点E.
(1)求证:DE是⊙O的切线.
(2)若∠B=30°,AB=8,求DE的长.
(1)求证:DE是⊙O的切线.
(2)若∠B=30°,AB=8,求DE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/3/1d0e2cd6-14ee-4cfc-8c3e-5fc8b93c0978.png?resizew=251)
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解答题-证明题
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适中
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【推荐2】如图,
是
的直径,点
在
上,且
,连接
并延长到点
,连接
,若
.
是
的切线;
(2)若
,求
的长.
![](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/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8cc88685997c7586d1d4bf75a055433.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e89eae3450a5509025325ec1ee94c328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/855ae5d6c521edb0aa75a2baf85ca0b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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