为什么圆的面积πr²的导数2πr正好是圆的�长，球的体积43πr³的导数4πr²正好是球的表面积？ 知乎 Sketch Coloring Page

为什么圆的面积πr²的导数2πr正好是圆的�长，球的体积43πr³的导数4πr²正好是球的表面积？ 知乎 Template

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