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球の表面積を半径から求める（円周率の精度を変えられるプチ電卓）

半径を入力すると球の表面積が計算できる電卓です。半径を入力してください。

球の表面積の公式

$S = 4 π r^{2}$

球の半径

円周率の精度

球の表面積

半径を入力すると球の表面積が計算できる電卓です。半径を入力してください。球の表面積S=4πr^2