如何证明抛物线上一点的焦半径绕焦点扫过的面积等于这点到准线垂线段扫过面积的一半？ 知乎 Sketch Coloring Page

如何证明抛物线上一点的焦半径绕焦点扫过的面积等于这点到准线垂线段扫过面积的一半？ 知乎 Template

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