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Revision history of "1986 IMO Problems/Problem 4"

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  • (cur | prev) 10:02, 30 January 2021‎ Hamstpan38825 (talk | contribs)‎ . . (1,608 bytes) (+1,608)‎ . . (Created page with "==Problem== Let <math>A,B</math> be adjacent vertices of a regular <math>n</math>-gon (<math>n\ge5</math>) with center <math>O</math>. A triangle <math>XYZ</math>, which is co...")
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