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[几何] 联赛几何

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大佬最帅 posted 2022-4-19 17:25 |Read mode
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乌贼 posted 2025-6-29 17:26
如图: 1.png
    $ AKPG $四点共圆,由链接:forum.php?mod=viewthread&tid=14027&pi … &extra=#pid67792
知$ PK=PQ $,有\[ PK^2=PK^2=PE\cdot PF\riff \triangle PKE\sim \triangle PFK\riff\angle PKE=\angle PFK\riff\angle AEK+\angle AFK=\angle APK=\angle AGK=\angle BCK \]

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