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兩個底角是45°,說明它是等腰梯形 過上底的兩個端點,作下底的垂線,把下底分成了三段,中間一段等於上底,另外兩段都等於高 梯形的上底是:17.5-2×5=7.5厘米 梯形的面積是:(7.5+17.5)×5÷2=62.5平方厘米
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