一个多边形的内角和为540°,则它是( )
A.四边形 | B.五边形 | C.六边形 | D.不是五边形 |
更新时间:2020-01-08 15:48:05
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【推荐2】如图所示,三角形纸片
中,
,将纸片的一角折叠,使点
落在
内,若
,则
的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/e7ce04f8-6f65-4768-a4c6-721364215575.png?resizew=176)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de2a5755c5012941c191329626b6db51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0b65ca62ce90b4879f58884e826c669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/e7ce04f8-6f65-4768-a4c6-721364215575.png?resizew=176)
A.45° | B.50° | C.55° | D.60° |
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