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如圖,設EF=a厘米,△EFG的高為h厘米那麼△EFG的面積為:(1/2)ah = 6那麼:ah = 12平行四邊形的邊:AB=3EF=3a平行四邊形的高為2h所以,平行四邊形的面積為:3a×2h = 6ah = 72平方厘米
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