Problem A. 484. (May 2009)
A. 484. In the Cartesian plane, a convex polygonal disk K is given. Apply the perpendicular affinity (x,y)(x,py) to the points of K, where 0<p<1. Denote the resulting polygonal disk by K'. Prove that K' can be covered by a polygonal disk which is congruent to K.
Deadline expired on June 15, 2009.
A possible solution can be read here.
1 student sent a solution. 5 points: Nagy 235 János.