TR-MO-R1 2013 Problem 8
Köşeleri, verilen bir düzgün yirmigenin köşelerinden dördünde yer alan kaç deltoid vardır?
a) 105 b) 100 c) 95 d) 90 e) 85
Official text Turkish Mathematical Olympiad, first round 2013 official paper, page 3. Quoted with source.
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