如图,D为⊙O上一点,点C在直径BA的延长线上,且∠CDA=∠CBD.
(1)判断CD与圆O的位置关系,并说明理由;
(2)若⊙O的半径为2,∠CBD=30°,求图中阴影部分的面积.
(1)判断CD与圆O的位置关系,并说明理由;
(2)若⊙O的半径为2,∠CBD=30°,求图中阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/2018/9/4/2025140503871488/2025994475347968/STEM/afca162d34fe49d996f8721ca514e8a2.png?resizew=204)
更新时间:2018-09-05 19:59:13
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适中
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【推荐1】如图,
为
直径点E为
上一点,
的平分线
交
于点C,过点C作
交
的延长线于点D,直线
与射线
交于点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/6f6d0efc-831b-43dc-ae40-613d8f12007b.png?resizew=171)
(1)求证:直线
为
切线;
(2)若线段
,
,求⊙O半径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ed75e65e7374c38ffb1f75259a8beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/025df2a9934b457cf20d91604e430612.png)
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【推荐2】如图,AB为⊙O的直径,C为⊙O上一点,连接AC,BC,D为AB延长线上一点,连接CD,且∠BCD=∠A.
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974403155959808/2977320260124672/STEM/4457a83f-1be2-419e-8a4d-5b1c090234af.png?resizew=229)
(1)求证:CD是⊙O的切线;
(2)过C作CF⊥AB于F,求证△DCO∽△CFO;
(3)若⊙O的半径为
,△ABC的面积为2
,求CD的长.
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974403155959808/2977320260124672/STEM/4457a83f-1be2-419e-8a4d-5b1c090234af.png?resizew=229)
(1)求证:CD是⊙O的切线;
(2)过C作CF⊥AB于F,求证△DCO∽△CFO;
(3)若⊙O的半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30efdb9c7eb4b788352056f3edf21635.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30efdb9c7eb4b788352056f3edf21635.png)
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【推荐1】如图,
是
的直径,点C是
上的一点,
与
的延长线交于点D,已知:
,
.
是
的切线;
(2)过点B作
于点E,若
的半径为2,求图中阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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(2)过点B作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b937442ad4cc480adc11bb143559454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,
为等腰直角三角形,
,点A,B在⊙O上,
,
的延长线分别与⊙O交于点E,F,G为
延长线上一点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/7dcf6919-7747-4118-af8e-54df472e53ce.png?resizew=143)
(1)求证:
为
的切线;
(2)若
,求
与弦
围成的阴影部分面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/7dcf6919-7747-4118-af8e-54df472e53ce.png?resizew=143)
(1)求证:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
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