下列三角形中,不是直角三角形的是( )
A.三条边长之比为![]() | B.三条边长之比为![]() |
C.三条边长之比为![]() | D.三个角度数之比为![]() |
更新时间:2023-09-05 15:54:13
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【推荐1】如图,在
中,
、
分别是
和
的平分线,
于
,交
于
,
于
,交
于
,
,
,
,
,结论:①
;②
;③
;④
.其中正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/9b455a8b-1044-4a83-a249-81a6ce42d4ef.png?resizew=273)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051ca3c8e6421a0bd30620416468dd42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fc998d33cdf37c272f79cfd64b7b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e88c47e28e6d4c017411c87100ac0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2765917637583d22a579ff075f9baa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/9b455a8b-1044-4a83-a249-81a6ce42d4ef.png?resizew=273)
A.4个 | B.3个 | C.2个 | D.1个 |
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【推荐2】适合下列条件的△ABC中,直角三角形的个数为( )
①∠A=32°,∠B=58°;
②a=6,∠A=45°;
③a=
,b=
,c=
;
④a=7,b=24,c=25;
⑤a=2,b=3,c=4.
①∠A=32°,∠B=58°;
②a=6,∠A=45°;
③a=
![](https://img.xkw.com/dksih/QBM/2016/4/27/1574198481666048/1574198487998464/STEM/34393c66f2474609bb81fc0333ef6967.png)
![](https://img.xkw.com/dksih/QBM/2016/4/27/1574198481666048/1574198487998464/STEM/a31c7432300a4b4cad7609b36f4a7791.png)
![](https://img.xkw.com/dksih/QBM/2016/4/27/1574198481666048/1574198487998464/STEM/d4b9580913d44d89b140aff31f115257.png)
④a=7,b=24,c=25;
⑤a=2,b=3,c=4.
A.2个 | B.3个 | C.4个 | D.5个 |
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【推荐1】“直角”在几何学习中无处不在,下列作图作出
一定是直角的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
A.①② | B.②③ | C.①②③ | D.①②④ |
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【推荐2】下列各组数中,能作为直角三角形的三边长的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
A.1,2,3 | B.1,![]() ![]() | C.3,5,5 | D.![]() ![]() ![]() |
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