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[几何] 等腰梯形求线段最大值

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乌贼 posted 2014-9-27 03:12 |Read mode
Last edited by 乌贼 2014-9-27 03:19等腰梯形$ABCD$中,$AB=CD,AD//BC,AB=4,BD=6,CE\perp BD$于$E$,求$CE$的最大值。
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kuing posted 2014-9-27 03:29
$CE\le CD=AB$

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original poster 乌贼 posted 2014-9-27 03:48
回复 2# kuing
尼玛这个链接的题就这样被你解了
   bbs.cnool.net/cthread-105412874.html
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original poster 乌贼 posted 2014-9-27 03:55
若$B,D$为定点,$A,C$点的轨迹为圆

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original poster 乌贼 posted 2014-9-27 13:56
回复 3# 乌贼
链接里的题放在高中背景就是一道双曲线题,用解析几何不好解……
$ACBK$为等腰梯形,$OB=\dfrac12BK=\dfrac12AC=2$,$M$的轨迹为圆。
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   另kuing在论坛上有过椭圆背景下角平分线的题

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