如图,在△ABC中,∠C = 90°,以AC为直径的⊙O交AB于点D,连接OD,点E在BC上, B E=DE.
(1)求证:DE是⊙O的切线;
(2)若BC=6,求线段DE的长;
(3)若∠B=30°,AB =8,求阴影部分的面积(结果保留
).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/19/2a2f2696-1dca-454e-8907-4ecd4924feaf.png?resizew=162)
(1)求证:DE是⊙O的切线;
(2)若BC=6,求线段DE的长;
(3)若∠B=30°,AB =8,求阴影部分的面积(结果保留
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0095ff23c519643e51650fe25184abec.png)
更新时间:2020-06-06 10:58:35
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【推荐2】如图,已知,线段
直线
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,平移线段
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与点
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操作与思考:
(1)画出线段
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(2)直线
与
的位置关系是_______,理由是:____________________________;
线段
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的数量关系是_______,理由是:____________________________.
实践与应用:
(3)如图,等边
和等边
的面积分别为3和5,点
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、
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(4)如图,网格中每个小正方形的边长为1,请用三种不同方法,求出
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
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线段
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【推荐1】如图,在Rt△ABC中,∠ACB=90°,点D是AB边上一点,以BD为直径的⊙O与边AC相切于点E,连接DE并延长DE交BC的延长线于点F.
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