Here is a grafical problem. You have to use two straight lines to cut up the pentagram star and you have to get 10 triangles. The triangles must not be counted twice. Or to put it another way, the same area can only be used once. http://poseidon.siol.net/samurai/racunalnistvo/media/star.gif[/URL] [Broken] [/PLAIN] [Broken] P.