ok, I have just learnt that using Pythagorean theory gives us the length of missing value with triangles, rest will have to wait til later, but I can see where we are heading, need to spend more time on this but basically a triangle is going to add up to 180degrees or 1 radian (half a circle) so it is a way of finding degrees.
Don't bombard me with any more until I get this bit firmly in my head, I'll give you a shout, in the meantime carry on playing **broken link removed**