天气预报 > 教育 > 圆面积公式推导
圆面积公式推导
更新时间: 2021-02-19 03:47:20  

1、圆面积公式是一种定理定律。为圆周率*半径的平方,用字母可以表示为:S=πr2或S=π*(d/2)2。

2、圆周率:π(数值为3.1415926至3.1415927之间……无限不循环小数),通常采用3.14作为π的数值,r表示半径,d表示直径)。

关键词: 面积 公式 推导

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