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[几何] 如何评价cmo P1

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大佬最帅 posted 2021-12-21 20:35 |Read mode
Screenshot_20211221_195544_com.tencent.mtt_edit_183357796395458.jpg
这题感觉好像中考题

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kuing posted 2021-12-21 22:15
确实没啥难度,图形关于 AC 对称,I 必在 AC 上,然后 IB 平分 ∠ABC,得 IA:IC=BA:BC=a:b,而 C 的轨迹是圆弧,故 I 的轨迹也是圆弧(关于 A 位似,比例为 a/(a+b))。

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