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正方形S=邊長的平方C=邊長x邊長 三角形S=底x高除以2 } C=邊長+邊長 平行四邊形S=底x高} 梯形S=(上底+下底)x高除以2 } 長方形S=長x寬C=(長x寬)x2 圓S=πd C=πr的平方
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