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[几何] 线段长最值

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guanmo1 posted 2020-4-4 22:46 |Read mode
Last edited by hbghlyj 2025-3-19 08:38在 $\triangle ABC$ 中, $BC=\sqrt{3} A C, \angle BAC=60\du$,点 D 与点 B 分别在直线 AC 的两侧,且 $A D=1, D C=\sqrt{3}$,则 $B D$ 长的最大值是

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original poster guanmo1 posted 2020-4-4 22:47
回复 1# guanmo1


    尝试用圆做, 感觉有点复杂。

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kuing posted 2020-4-5 02:18

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original poster guanmo1 posted 2020-4-5 20:45
回复 3# kuing

是的。但正余弦定理的常规搞法可好搞呢?

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