User contributions
- 13:24, 14 August 2012 (diff | hist) . . (-11) . . KGS math club/solution 11 20 (current)
- 13:23, 14 August 2012 (diff | hist) . . (+58) . . KGS math club
- 13:22, 14 August 2012 (diff | hist) . . (+219) . . N KGS math club/solution 11 20 (Created page with "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 that few calculations le...")
