下列说法中,错误的是( )
A.三角形的三条内角平分线必定交于一点,且这一点到三边的距离相等 | B.三角形三边的垂直平分线交于一点,且这一点到三个顶点的距离相等 |
C.有一个角为![]() | D.每一个命题一定有逆命题,每一个定理一定有逆定理 |
更新时间:2024-05-25 17:50:11
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【推荐1】如图所示,有三条道路围成Rt△ABC,其中BC=1000m,一个人从B处出发沿着BC行走了800m,到达D处,AD恰为∠CAB的平分线,则此时这个人到AB的最短距离为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/5/c1e855f4-fe0f-45dc-9bae-be0716b1edb6.png?resizew=146)
A.1000m | B.800m | C.200m | D.1800m |
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【推荐2】如图,在△ABC中,AD平分∠BAC,DE⊥AB于E,
=15,DE=3,AB=6,则AC长是( )
![](https://img.xkw.com/dksih/QBM/2020/12/9/2610454649913344/2610731488976896/STEM/65a0adc3-627c-41a0-a9fd-aa0fc400af13.png?resizew=200)
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A.4 | B.5 | C.6 | D.7 |
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【推荐1】如图,DE 是△ABC 中 AC 边上的垂直平分线,如果 BC=9cm, AB=11cm,则△EBC 的周长为( )
![](https://img.xkw.com/dksih/QBM/2018/12/18/2099576211914752/2101514013253632/STEM/ce525887db654c2ba3dcf81d080f22b6.png?resizew=112)
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A.9cm | B.11cm | C.20cm | D.31cm |
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【推荐2】如图,在
中,
,
是
的垂直平分线,
是直线
上的任意一点,则
的最小值是( )
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A.3 | B.4 | C.5 | D.无法确定 |
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【推荐1】如图,在
中,
,D是边BC上的中点,若
,
,则
的周长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/19/402761c7-088c-44ab-872a-c652dfff72a6.png?resizew=124)
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A.6 | B.8 | C.10 | D.12 |
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【推荐2】如图,在
中,
,
,
,将
绕点C按逆时针方向旋转得到
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恰好在
边上,则点
与点B之间的距离为( )
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A.2 | B.4 | C.2![]() | D.2![]() |
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【推荐1】下列命题的逆命题是真命题的是( )
A.若![]() ![]() | B.同位角相等,两直线平行 |
C.对顶角相等 | D.若![]() ![]() ![]() |
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【推荐2】下列各命题都成立,而它们的逆命题不能成立的是( ).
A.两直线平行,同位角相等 | B.全等三角形的对应角相等 |
C.四边相等的四边形是菱形 | D.直角三角形中, 斜边的平方等于两直角边的平方和 |
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