如图,在△ABC中,以AB为直径的⊙O交AC于点D,过点D作DE⊥BC于点E,且∠BDE=∠A.
![](https://img.xkw.com/dksih/QBM/2015/9/6/1573909843025920/1573909849481216/STEM/9bd947aa993c4909a28a98bec3d2e320.png?resizew=190)
(1)判断DE与⊙O的位置关系,并说明理由;
(2)若AC=16,tanA=
,求⊙O的半径.
![](https://img.xkw.com/dksih/QBM/2015/9/6/1573909843025920/1573909849481216/STEM/9bd947aa993c4909a28a98bec3d2e320.png?resizew=190)
(1)判断DE与⊙O的位置关系,并说明理由;
(2)若AC=16,tanA=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
更新时间:2016-12-06 02:30:41
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解答题-证明题
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适中
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【推荐1】如图,已知
内接于
,
为
的直径,
,交
的延长线于点D.
(1)E为
的中点,连接
,求证:
是
的切线;
(2)若
,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/31/77b62bf6-225c-4678-a428-66cf632e3649.png?resizew=155)
(1)E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe420c07ce33b530869dde98ede00a7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
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解答题-证明题
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【推荐2】如图,点
,
,
是半径为3的⊙
上三个点,
为直径,
的平分线交圆于点
,过点
作
的垂线交
的延长线于点
,延长
交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/c0ef2836-7bfa-47dc-8cc5-57ebf3b8c6a9.png?resizew=191)
(1)判断直线
与⊙
的位置关系,并证明.
(2)若
.求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/c0ef2836-7bfa-47dc-8cc5-57ebf3b8c6a9.png?resizew=191)
(1)判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169145cfb31e4fc502a3b2f47a644831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e8d0a44969df78c85792d5d2ba4861.png)
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【推荐1】如图,将平行四边形ABCD纸片沿EF折叠,使点C与点A重合,点D落在点G处.
(1)连接CF,求证:四边形AECF是菱形;
(2)若E为BC中点,BC=26,tan∠B=
,求EF的长.
(1)连接CF,求证:四边形AECF是菱形;
(2)若E为BC中点,BC=26,tan∠B=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb16d1089cf194d658387742e1c2a93.png)
![](https://img.xkw.com/dksih/QBM/2019/6/6/2219634707456000/2223362514419712/STEM/8568333c721b4658945965c0abf3f8fa.png?resizew=348)
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【推荐2】如图,在△ABC中,AB=AC,BC=8,tanC=
,点M、N分别在AB、BC上,且AM=CN=2.点P从点M出发沿折线MB﹣BN匀速移动,到达点N时停止;而点Q在AC边上随P移动,且始终保持∠APQ=∠B.
(1)求点P在BN上运动时,点P与点A的最短距离;
(2)若点P在MB上,且PQ将△ABC的面积分成上下4:5两部分时,求MP的长;
(3)求整个运动过程点Q运动的路径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
(1)求点P在BN上运动时,点P与点A的最短距离;
(2)若点P在MB上,且PQ将△ABC的面积分成上下4:5两部分时,求MP的长;
(3)求整个运动过程点Q运动的路径长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/17d9bf4d-f1e5-451b-b4c5-0af2f6c62b04.png?resizew=470)
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