TR-MO-R1 2008 Problem 25
merkezli çemberde çaptır. ve noktaları çember üzerinde çapına göre farklı yarım çemberler üzerindedirler. den ye inen dikmenin ayağı olsun. , ve olduğuna göre açısı kaç derecedir?
a) 30 b) 45 c) 60 d) 75 e) 80
Official text Turkish Mathematical Olympiad, first round 2008 official paper, page 8. Quoted with source.
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