下面叙述不可能是等腰三角形的是( )
A.有两个内角分别为75°,75°的三角形 |
B.有两个内角分别为110°和40°的三角形 |
C.有一个外角为100°,一个内角为50°的三角形 |
D.有一个外角为140°,一个内角为100°的三角形 |
更新时间:2020-08-08 11:57:39
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【推荐1】如图,已知在
中,
,
.从点A开始,把若干根相同小棒
顺次连接摆放在边
,
之间,并使小棒两端分别落在边
,
上,在
内(不包括边)摆放最后一根小棒时,其端点恰好能与点B或点C重合,则此时
内(不包括边)顺次连接了( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cdc5c5356ec37800b9e71ee1ad5cca7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b83e50b8b7611ed290287f423cc6e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/28/641996a1-fb40-414b-b3d3-19f7af087b01.png?resizew=161)
A.3根小棒 | B.4根小棒 | C.5根小棒 | D.6根小棒 |
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【推荐2】如图所示,将分别含有30°,45°角的一副三角板重叠,使直角顶点重合,若两直角重叠形成的角为75°,则图中∠α的度数为( )
![](https://img.xkw.com/dksih/QBM/2021/11/19/2854712870559744/2859463156547584/STEM/9a9e9f3a-4295-4f17-af0b-0460cae65578.png)
![](https://img.xkw.com/dksih/QBM/2021/11/19/2854712870559744/2859463156547584/STEM/9a9e9f3a-4295-4f17-af0b-0460cae65578.png)
A.160° | B.150° | C.140° | D.130° |
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【推荐1】已知一个三角形中两个内角分别是
和
,则这个三角形一定是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb90b8c8cadeb19eaf4e2abec1ab413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5511a89c160d515716f514c7f9041f91.png)
A.钝角三角形 | B.直角三角形 | C.等腰三角形 | D.不能确定 |
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【推荐2】如图,在
中,
,点
都在边
上,且
,若
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/2021/1/31/2647964801622016/2652399882199040/STEM/e8050dfcbd4a4669ab9cfafdb2e90c92.png?resizew=161)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/2021/1/31/2647964801622016/2652399882199040/STEM/e8050dfcbd4a4669ab9cfafdb2e90c92.png?resizew=161)
A.2 | B.3 | C.4 | D.5 |
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