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長方形の周囲=(長さ+幅)×2正方形の周囲=辺の長さ×4長方形の面積=長さ×幅の正方形の面積=辺の長さ×辺の長さの三角形の面積=底面×高÷2平行四辺形の面積=底面×高さの台形の面積=(上端+下端)×高÷2直径=半径×2半径=直径÷2円の...
底面面積*高
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