KGS math club/solution 11 20
Revision as of 14:24, 14 August 2012 by Flyingdario (talk | contribs)
By drawing all diagonals and looking at angles we see that the triangles formed by {c, d, d} and {c, c, d-c} are similar.
Then c : d = (d-c) : c
After few calculations c : d = 
