如图,AB是⊙O的直径,弦CD垂直平分OA,垂足为点M,连接并延长CO交⊙O于点E,分别连接DE,BE,DB,其中∠EDB=30°,∠CDE的平分线DN交CE于点G,交⊙O于点N,延长CE至点F,使FG=FD.
(1)求证:DF是⊙O的切线;
(2)若⊙O半径r为8,求线段DB,BE与劣弧DE所围成的阴影部分的面积.
(1)求证:DF是⊙O的切线;
(2)若⊙O半径r为8,求线段DB,BE与劣弧DE所围成的阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/2018/9/10/2029578269278208/2031656325931009/STEM/7091c68c6c114a88b33fd7a25e9eee53.png?resizew=128)
更新时间:2018-09-13 19:58:17
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【推荐1】如图,
是
的直径,点
是
上的一点,
与
的延长线交于点
.已知:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/f13f20fe-ee97-41b3-9426-cb6ea6d66596.png?resizew=176)
(1)求证:
是
的切线;
(2)过点
作
于点
,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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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294c9e9cb8638b2c25e117a56f0f3888.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/f13f20fe-ee97-41b3-9426-cb6ea6d66596.png?resizew=176)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b937442ad4cc480adc11bb143559454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,⊙
半径为
,
是⊙
的直径,
是⊙
上一点,连接
,⊙
外的一点
在直线
上.
(
)若
,
.
①求证:
是⊙
的切线.
②阴影部分的面积是 .(结果保留
)
(
)当点
在⊙
上运动时,若
是⊙
的切线,探究
与
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e240a6378adf6d23ebf9cc710c9bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa4faa285fcaf75d7ea2f223ae53401.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
②阴影部分的面积是 .(结果保留
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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名校
【推荐1】如图,在
中,
,
,
.以
为直径的
交
于
,
是
的中点,连接
并延长交
的延长线于点
.
是
的切线;
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
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(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
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【推荐2】如图①,
是
的半径,点P是
上一动点,过P作弦
弦
,垂足为E,连结
,
,
,
.
.
(2)当
时,求证:
.
(3)如图②,在(2)的条件下,连结
.
①若
的面积为12,
,求
的面积.
②当P是
的中点时,求
的值.
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(2)当
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(3)如图②,在(2)的条件下,连结
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①若
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②当P是
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