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悠闲数学娱乐论坛(第3版)
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求教一道立体几何题
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[几何]
求教一道立体几何题
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Gadfly
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Post time 2015-1-26 23:23
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棱长为1的正方体AC1，点M在与正方体的各棱都相切的球面上运动，点N在三角形ACB1的外接圆上运动，则线段MN长度的最小值是
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Post time 2015-1-26 23:39
目测$(\sqrt3-\sqrt2)/2$
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Post time 2015-1-27 01:38
也就是半条体对角线减去棱切球半径
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Post time 2015-1-27 09:05
为什么是半个体对角线呢
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Post time 2015-1-27 09:16
已经搞懂，大神，谢谢啦
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