Problem C. 1262. (December 2014)
C. 1262. Prove that if a cyclic quadrilateral has an inscribed circle and a right angle, then it is symmetrical.
(5 pont)
Deadline expired on 12 January 2015.
Statistics:
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. 
