Just to make sure I understand what you mean, could you give one example of an integer angled quadrilaterals that is both cyclic and a kite, but not a square? Otherwise all I can suggest if that the most typical mistake on this problem is not to account for rotation/reflection correctly when counting "def345 wrote:I've written 2 programs months apart to solve this problem, both of these get <snip> as the answer but Euler doesn't agree this is the right answer. I've counted analytically the number of solutions that are Cyclic Quadrilateral (opposite angles add up to 180 degrees) and the number that are Kites, these being <snip>and <snip> respectively and these are the number my programs get (45 of these solutions being both cyclic and a kite). Can anyone else suggest anything else I can do to debug my program.

*non-similar*integer angled quadrilaterals".

Also, please don't post partial answers, correct or incorrect.