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一个边长为2的正多边形的内角和是其外角和的2倍,则这个正多边形的半径是( ) A...
一个边长为2的正多边形的内角和是其外角和的2倍,则这个正多边形的半径是( )
A.2
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190745953531906/SYS201311011907459535319007_ST/0.png)
C.1
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190745953531906/SYS201311011907459535319007_ST/1.png)
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