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[几何] 证三点共线(竞赛)

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isee posted 2021-8-6 21:29 |Read mode
Last edited by isee 2021-8-10 00:30点$P$是平行四边形$ABCD$两对角线的交点,$M$是$AB$边的中点,$Q$满足$QA$与三角形$MAD$的外接圆相切,且$QB$与三角形$MBC$的外接圆也相切.
证明:$M$,$Q$,$P$三点共线.

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(2020年捷克 波兰 斯洛伐克数学竞赛试题第1题)

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