在△ABC中,∠C=90°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/28/0820bfd1-b07e-4fac-ba8b-6dab19c3c3d2.png?resizew=527)
(1)如图①,点O在斜边AB上,以点O为圆心,OB长为半径的圆交AB于点D,交BC于点E,与边AC相切于点F,求证:∠1=∠2;
(2)在图②中作⊙M,使它满足以下条件:①圆心在边AB上;②经过点B;③与边AC相切;
(尺规作图,只保留作图痕迹,不要求写出作法)
(3)在(2)问条件下,若∠A=30°,⊙M的半径为2,求线段BC的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/28/0820bfd1-b07e-4fac-ba8b-6dab19c3c3d2.png?resizew=527)
(1)如图①,点O在斜边AB上,以点O为圆心,OB长为半径的圆交AB于点D,交BC于点E,与边AC相切于点F,求证:∠1=∠2;
(2)在图②中作⊙M,使它满足以下条件:①圆心在边AB上;②经过点B;③与边AC相切;
(尺规作图,只保留作图痕迹,不要求写出作法)
(3)在(2)问条件下,若∠A=30°,⊙M的半径为2,求线段BC的长.
更新时间:2022-04-10 12:41:19
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【推荐2】作图题(用直尺和圆规,保留作图痕迹,不写作法)
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【推荐1】在数学课上,老师提出如下问题,尺规作图:过直线外一点作已知直线的垂线.
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为圆心,线段
的长度为半径作弧,两弧相交于点
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即为所求
如图
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(1)证明:
直线
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【推荐2】如图,在△ABC中,BD平分∠ABC交AC于点D,AD=BD.
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