在一个半径为1的，圆心角为90度的扇形内做一个面积最大的圆，求圆的半径？ 知乎 Sketch Coloring Page

在一个半径为1的，圆心角为90度的扇形内做一个面积最大的圆，求圆的半径？ 知乎 Template

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