一个多边形的内角和是外角和的2倍，则这个多边形的边数为（）

一个多边形的内角和是外角和的2倍，则这个多边形的边数为（　　）

A．4 B．5 C．6 D．7

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解析:略

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一个多边形的内角和是外角和的2倍，则这个多边形的边数为（ ）

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一个多边形的内角和是外角和的2倍，则这个多边形的边数为（）