已知
的三边长分别为
,
,
,则下列条件中能确定
是直角三角形的条件是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-11-23 09:08:58
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【推荐1】如图,若
,直线
分别交
,
于点
,
,
交
于点
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84756764173829ecd7d0272785c7e19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcc3ef6a72ecee9efdca1f447fa243d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc310194575262fb45352c2fbc19868.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/6/47d37d69-904a-4859-8b0b-15dfd5d7793d.png?resizew=160)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在△ABC中,∠C=90°,∠B=30°,以A为圆心,任意长为半径画弧,分别交AB、AC于点M和点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,下列结论:①AD是∠BAC的平分线;②∠ADB =120°;③AD=BD;④DB=2CD.其中正确的结论共有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/f09b5f00-4887-4c5f-be19-99598beb2f20.png?resizew=152)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/f09b5f00-4887-4c5f-be19-99598beb2f20.png?resizew=152)
A.4 个 | B.3 个 | C.2 个 | D.1 个 |
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【推荐1】已知△ABC中,a,b,c分别是∠A,∠B,∠C的对边,下列条件不能判定△ABC是直角三角形的是( )
A.a2=b2+c2 | B.![]() |
C.∠A=∠C-∠B | D.∠A:∠B:∠C=3:4:5 |
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【推荐2】
、
、
是
的三边长,且关于
的方程
有两个相等的实数根,这个三角形是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba78d97352b5bfa7a47a9e4d32eed65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9985ad1358d0fddcb8bfc99deb95bf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2db0d43b20477def3d3c650932f101e.png)
A.等边三角形 | B.钝角三角形 | C.直角三角形 | D.等腰直角三角形 |
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