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平面图形面积公式推导过程总复习

当前等分数：16

圆的面积

分割份数

展开进度 0%

拼合进度 0%

等分越多，越接近长方形

长 ≈ $π r$ ，宽 ≈ $r$

$S = π r^{2}$

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