如图,点A是
外一点,过点A作出
的一条切线.(使用尺规作图,作出一条即可,不要求写出作法,不要求证明,但要保留作图痕迹)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892977239670784/2895025445183488/STEM/0d6b6bef-12ab-4e98-b88f-9dcf8a9b377f.png?resizew=186)
更新时间:2022-01-15 15:27:15
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解答题-证明题
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【推荐1】如图,点A是⊙O直径BD延长线上的一点,AC是⊙O的切线,C为切点.AD=CD,
(1)求证:AC=BC;
(2)若⊙O的半径为1,求△ABC的面积.
(1)求证:AC=BC;
(2)若⊙O的半径为1,求△ABC的面积.
![](https://img.xkw.com/dksih/QBM/2019/12/26/2363227118231552/2364013367664640/STEM/0d8f2ece27bb47678b1c60a6d57ea1b8.png?resizew=192)
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解答题-作图题
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【推荐2】(1)如图,AB是半圆的直径,点C在半圆外,请仅用无刻度的直尺画出△ABC的三条高的交点;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/e11bfd6d-5e52-48d6-893f-722689f1d595.png?resizew=161)
(2)已知⊙O如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/baa26e8f-b490-4290-8c86-b21091e40208.png?resizew=125)
①求作⊙O的内接正方形(尺规作图,保留作图痕迹,不写作法);
②若⊙O的半径为4,则它的内接正方形的边长为_______________.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/e11bfd6d-5e52-48d6-893f-722689f1d595.png?resizew=161)
(2)已知⊙O如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/baa26e8f-b490-4290-8c86-b21091e40208.png?resizew=125)
①求作⊙O的内接正方形(尺规作图,保留作图痕迹,不写作法);
②若⊙O的半径为4,则它的内接正方形的边长为_______________.
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解答题-证明题
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真题
名校
【推荐1】如图,M,N是以AB为直径的⊙O上的点,且
=
,弦MN交AB于点C,BM平分∠ABD,MF⊥BD于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/28/000372e4-9eb3-48c3-8749-db3d79ec3530.png?resizew=207)
(1)求证:MF是⊙O的切线;
(2)若CN=3,BN=4,求CM的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87f40e86b2e370f43e6ee6e7cfffadf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b251d9a09df06b99a29716a550ac9bc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/28/000372e4-9eb3-48c3-8749-db3d79ec3530.png?resizew=207)
(1)求证:MF是⊙O的切线;
(2)若CN=3,BN=4,求CM的长.
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解答题-证明题
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【推荐2】如图,
是
的直径,A是
延长线上的一点,点E在
上,
,交
的延长线于点C,
交
于点F,且点E是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/a817a564-0708-4185-826c-d584d293a044.png?resizew=222)
(1)求证:
是
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff24d05b5b9502c2be337f9be84fe4ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbdb53e0fdf3ebeb96e4f69feacbd80e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/a817a564-0708-4185-826c-d584d293a044.png?resizew=222)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bbd04b75eb3db55fc13d78e7c30188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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