如图,在△ABC中,∠C=90°,以A为圆心,任意长为半径画弧分别交AB,AC于点M和N,再分别以M、N为圆心,大于
MN的长为半径画弧,两弧交于点P,连接AP并延长交BC于点D,则下列结论:①AD是∠BAC的平分线;②若∠B=30°,则DA=DB;③AB:AC=2:1;④点D在AB的垂直平分线上.一定成立的个数为( )
![](https://img.xkw.com/dksih/QBM/2020/4/8/2436851955146752/2437070230740992/STEM/c39d25ae-d2d2-41f3-98d8-1ac15147338d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2020/4/8/2436851955146752/2437070230740992/STEM/c39d25ae-d2d2-41f3-98d8-1ac15147338d.png)
A.1个 | B.2个 | C.3个 | D.4个 |
更新时间:2020-04-08 14:54:59
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【推荐1】下列尺规作图中,属于作一个锐角平分线的是( )
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【推荐2】如图,在
中,
,以A为圆心,任意长为半径画弧分别交
,
于点
,
,再分别以
,
为圆心,大于
的长分别为半径画弧,两弧交于点
,作射线
交
于点
,若
,
,则
的面积为( )
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【推荐1】如图所示的图形中,
,
,那么( )
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C.![]() ![]() | D.![]() |
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【推荐2】如图,在
中,分别以点
为圆心,大于
长为半径作弧,两弧交于点
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分别交
,
于点
,连接
,下列结论错误的是( )
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【推荐1】如图,梯子与地面的夹角为
,上端
靠墙,底端
距离墙角
米,则梯子的长度为( )
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在
中,
,
,以
为圆心,适当长为半径画弧,交
于点
,交
于点
再分别以
,
为圆心,大于
的长为半径画弧,两弧在
内部交于点
连接
并延长,交
于点
有下列说法:①线段
是
的平分线;②
;③点
到
边的距离与
的长相等;④
;其中正确结论的个数是( )
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【推荐1】已知
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、
是
的三边,且满足
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一定是( )
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A.任意三角形 | B.等腰三角形 | C.等边三角形 | D.直角三角形 |
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【推荐2】△ABC中,AD,BE分别是边BC,AC上的高,若∠EBC=∠BAD,则△ABC一定是( )
A.等腰三角形 | B.等边三角形 |
C.直角三角形 | D.等腰直角三角形 |
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