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TR-MO-R1 2008 Problem 25

    OO merkezli çemberde [AB][AB] çaptır. CC ve DD noktaları çember üzerinde [AB][AB] çapına göre farklı yarım çemberler üzerindedirler. BB den [CD][CD] ye inen dikmenin ayağı HH olsun. ∣AO∣=13|AO| = 13, ∣AC∣=24|AC| = 24 ve ∣HD∣=12|HD| = 12 olduğuna göre DCBDCB 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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