将两块含
角的直角三角板
按如图方式放置,其中点E在
上,点A在
上,若
,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15e262d345048e3b1457207bded90c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdbbe0d2d21c2fef2c8ccfbf0fcf386d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6344778ed1e75c1a99e2268468081867.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-05-09 21:57:49
|
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【推荐1】如图,将一个含有30°角的直角三角板放置在两条平行线a,b上,若
,则
的度数为( )
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892979937714176/2894940515532800/STEM/d50d7233-74df-4b07-a933-69737712dbaf.png?resizew=193)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac56dcc9b3a42da408d4b6f9e643ada8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892979937714176/2894940515532800/STEM/d50d7233-74df-4b07-a933-69737712dbaf.png?resizew=193)
A.85° | B.75° | C.55° | D.95° |
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【推荐2】有两个直角三角形纸板,一个含45°角,另一个含30°角,如图①所示叠放,先将含30°角的纸板固定不动,再将含45°角的纸板绕顶点A顺时针旋转,使BC∥DE,如图②所示,则旋转角∠BAD的度数为( )
A.15° | B.30° | C.45° | D.60° |
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【推荐1】
三边为
、
、
,下列条件不能判定
是直角三角形的是( )
![](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.![]() |
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【推荐2】如图,△ABC≌△ADE,若∠BAE=120°,∠BAD=40°,则∠BAC的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/9691a261-61ab-441e-967b-cf0663e4e22d.png?resizew=179)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/9691a261-61ab-441e-967b-cf0663e4e22d.png?resizew=179)
A.40° | B.80° | C.120° | D.不能确定 |
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