连接中心与各顶点。有2n个全等的三角形。割线分割了两个。但是平分了它们。其它三角形每边有n-1个,
连接中心与各顶点。有2n个全等的三角形。割线分割了两个。但是平分了它们。其它三角形每边有n-1个,
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