不是等腰梯形，上底和下底分别是a和b。如何用a，b来表示此梯形内接圆的直径？ 知乎 Sketch Coloring Page

不是等腰梯形，上底和下底分别是a和b。如何用a，b来表示此梯形内接圆的直径？ 知乎 Template

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