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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tomski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 coloring