�们知道n边形的内角和等于n 2180°．如果一个多边形的内角和是外角和的3倍则它是 A．七边形b．八边形c．九边形d．十边形 Sketch Coloring Page

�们知道n边形的内角和等于n 2180°．如果一个多边形的内角和是外角和的3倍则它是 A．七边形b．八边形c．九边形d．十边形 Template

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tomski�们知道n边形的内角和等于n 2180°．如果一个多边形的内角和是外角和的3倍则它是 a．七边形b．八边形c．九边形d．十边形 coloring

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