如图,在△ABC中,AB=AC.在AB、AC上分别截取AP、AQ,使AP=AQ.再分别以点P,Q为圆心,以大于
PQ的长为半径作弧,两弧在∠BAC内交于点R,作射线AR,交BC于点D.已知BC=5,AD=6.若点M、N分别是线段AD和线段AC上的动点,则CM+MN的最小值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/d2cdb7d9-1e98-429c-8f27-0c710f3a6277.png?resizew=147)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/d2cdb7d9-1e98-429c-8f27-0c710f3a6277.png?resizew=147)
A.4 | B.5 | C.![]() | D.2![]() |
更新时间:2022-04-30 11:30:31
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【推荐1】已知在△ABC中,D为BC的中点,AD=6,BD=2.5,AB=6.5,点P为AD边上的动点.点E为AB边上的动点,则PE+PB的最小值是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/d39ef616-8307-4392-b9f1-3ce240b6efd0.png?resizew=134)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/d39ef616-8307-4392-b9f1-3ce240b6efd0.png?resizew=134)
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【推荐2】如图,
中,
,
于点
,
,
是线段
上的一个动点,则
的最小值是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/56b3ad8b-4e16-4b9a-9e9d-a990b636b64c.png?resizew=128)
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【推荐1】下列说法正确的有( )个
①两个全等的三角形一定关于某直线对称;②若三角形一个外角的平分线平行于三角形的一边,则这个三角形为等腰三角形;③等腰三角形中线、高线、角平分线互相重合;④三角形两边的垂直平分线的交点到三个顶点距离相等;⑤顶角的平分线所在的直线是等腰三角形的对称轴.
①两个全等的三角形一定关于某直线对称;②若三角形一个外角的平分线平行于三角形的一边,则这个三角形为等腰三角形;③等腰三角形中线、高线、角平分线互相重合;④三角形两边的垂直平分线的交点到三个顶点距离相等;⑤顶角的平分线所在的直线是等腰三角形的对称轴.
A.4 | B.3 | C.2 | D.1 |
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【推荐2】如图,在平面直角坐标系中,已知抛物线
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,过点
作
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,
交
于点
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关于直线
的对称点为
,连接
,
,过点A作AE⊥x轴,垂足为E,则当
( )时,
的周长最小.
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【推荐1】如图,已知
,点P在边
上,
,点E,F在边
上,连接
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【推荐2】如图,在
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,
,
,观察图中尺规作图的痕迹
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【推荐1】已知二次函数
的图象与
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【推荐2】如图,菱形
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