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圓的周長的一半等於長方形的長,是πR,圓的半徑等於長方形的寬是R 長方形的長比圓的周長新增了2R 2πR+2R=(2×3.14+2)×R=8.28R=41.4 R=41.4÷8.28 R=5 它的面積是:3.14×5²;=78.5
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