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[几何] 又是最值问题

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lrh2006 Posted 2021-12-3 23:28 |Read mode
Last edited by hbghlyj 2025-5-10 16:38C是线段AB上一点, AB = 6 , AC= 4 ,分别以AB,AC为直径,在AB的同侧作半圆 O1 O2,它们的中点分别为D,E,则DE的长为
如图2,现将半圆绕点旋转, 取DE中点P,连结AP,在旋转过程中,AP的最小值为
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isee Posted 2021-12-4 00:11
回复 1# lrh2006

图 2 中连接 EA 并取其中点 M,连接 PM 则 $PM=\frac {AD}2$,AD 是定长,所以点 P 在以 M 为圆心,半径为 PM 的圆上运动,下略

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