Triangles trouble

Can somebody please help me with the task triangles, it fails on the third test case, but I just can't find the bug. It gives a correct result for everything I try. My source code is:
http://www.z-trening.com/new/www/html/submit.php?submit=7100052392&subm_code=1

Maybe try to tell us your idea, I have no time atm to look at code :S