Problem A. 639. (March 2015)
A. 639. The angle trisectors of a triangle bound a convex hexagon in the interior of the triangle. Prove that the diagonals of this hexagon, that connect opposite vertices, are concurrent.
Proposed by: Zoltán Bertalan, Békéscsaba
Deadline expired on April 10, 2015.
9 students sent a solution. 5 points: Adnan Ali, Csépai András, Fehér Zsombor, Glasznova Maja, Janzer Barnabás, Porupsánszki István, Schrettner Bálint, Wei Cong Wu, Williams Kada.