请问怎么求圆的面积/周长？我五年级，我妈叫我做六年级的，根本不会嘛！不知何方神圣能帮帮我，谢谢了！
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圆的周长=圆周率乘以直径。 公式C=2πR或πD
R代表半径,D代表直径
面积S=3.14×圆半径×圆半径
周长C=2×3.14×圆半径
3.14为π的值。
面积等于π乘半径的平方，周长是2乘π乘半径
面积：π×r的平方
周长：2π×r
圆的周长C=2*pi*r;面积S=pi*r*r。pi=3.14
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