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C. 1262. Prove that if a cyclic quadrilateral has an inscribed circle and a right angle, then it is symmetrical.

(5 points)

Deadline expired on 12 January 2015.

Statistics on problem C. 1262.
 169 students sent a solution. 5 points: 91 students. 4 points: 16 students. 3 points: 9 students. 2 points: 15 students. 1 point: 29 students. 0 point: 7 students. Unfair, not evaluated: 2 solutions.

• Problems in Mathematics of KöMaL, December 2014

•  Támogatóink: Morgan Stanley