具备下列条件的四个三角形中,不是直角三角形的是( )
A.∠A![]() ![]() ![]() | B.∠A-∠B![]() |
C.∠A+∠B![]() | D.∠A![]() |
更新时间:2020-08-26 11:37:38
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【知识点】 直角三角形的两个锐角互余解读
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【推荐1】已知:在四边形
中,
,
,点
是线段
上一点,且
平分
,
平分
,给出下面四个结论:①
;②
;③
;④
.上述结论中,所有正确结论的序号是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/e04efa17-c689-42eb-a2d3-41a7b3f8ce8b.png?resizew=167)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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A.①② | B.③ | C.①②③ | D.①②③④ |
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【推荐2】在下列条件中(1)∠A+∠B=∠C;(2)∠A:∠B:∠C=1:2:3;(3)∠A=∠B=
∠C;(4)∠A=
∠B=
∠C中,能确定△ABC为直角三角形的条件有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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A.1个 | B.2个 | C.3个 | D.4个 |
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