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The Intl Math Olympics of 2011 had a problem that stumped many young participants except one who received a perfect score:
Its called the Windmill problem:
More here at AoPS:
https://artofproblemsolving.com/wiki/index.php?title=2011_IMO_Problems/Problem_2
Its called the Windmill problem:
More here at AoPS:
https://artofproblemsolving.com/wiki/index.php?title=2011_IMO_Problems/Problem_2