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[几何] 一道初中几何最值

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hbghlyj

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hbghlyj posted 2020-2-7 12:03 |Read mode
Last edited by hbghlyj 2020-2-7 12:18B,D在半径为5的$\odot O$上运动,$AO=\sqrt5$,$\angle BAD=60°$,作平行四边形ABCD,则AD的取值范围为
QQ图片20200123152407.png
建系发现D的轨迹是椭圆，长轴在直线OA上
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