练习四:(找角高手),找一找下面的图形有多少个角?
![C2Y[ZZ@%YUW(X5BE2BMOM.jpg(https://bbscdn.xsj21.com/usercontent/赵媛媛/image/C2Y[ZZ@%]Y[UW(X5BE2BMOM.jpg) ](https://bbs.xsj21.com/member/%] Y UW(X5BE2BMOM.jpg