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首先要知道有三種情况 1.截邊不與任意頂點重合 此時多了一個角和邊 2.截邊與一個頂點重合 此時角和邊不多不少 3.截邊與兩個頂點重合 此時少了一個角和邊 那麼新的圖形的邊數=1620/180+2=11邊 11-1=10 11+1=12 所以原多邊形的邊數為10、11、12條
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