如图,P为n边形A1A2.An内一点,联结PA1、PA2.、PAn,那么n边形被分成了n个三角形,由此推理出n边形的内角和
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![如图,P为n边形A1A2.An内一点,联结PA1、PA2.、PAn,那么n边形被分成了n个三角形,由此推理出n边形的内角和](/uploads/image/z/14760659-11-9.jpg?t=%E5%A6%82%E5%9B%BE%2CP%E4%B8%BAn%E8%BE%B9%E5%BD%A2A1A2.An%E5%86%85%E4%B8%80%E7%82%B9%2C%E8%81%94%E7%BB%93PA1%E3%80%81PA2.%E3%80%81PAn%2C%E9%82%A3%E4%B9%88n%E8%BE%B9%E5%BD%A2%E8%A2%AB%E5%88%86%E6%88%90%E4%BA%86n%E4%B8%AA%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E7%94%B1%E6%AD%A4%E6%8E%A8%E7%90%86%E5%87%BAn%E8%BE%B9%E5%BD%A2%E7%9A%84%E5%86%85%E8%A7%92%E5%92%8C)
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