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把同樣的一個梯形上下顛倒放在原梯形旁,可得一個平行四邊形,且可知梯形面積是該平行四邊形的一半,平行四邊形的底等於梯形的上底加下底,高和梯形的高相等,平行四邊形的面積等於底乘高,即梯形的上下底之和乘以高,而梯形面積是平行四邊形的一半,所以梯形面積等於(上底加下底)乘以高除以二百
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