[SteveyBaby]

I know, i know!!! Erm basically both hypotenuse of the two triangles within the triangle arent at the same gradient (angle as each other). When theyre changed around it allows the yellow shaped to move out slightly.

Its kinda hard what im trying to explain, but if you look at the first traingle shape made, the hypotenuse of the whole shape bends in slightly, taking up the area of the square which becomes available when the shapes are moved to the position of the second triangle (if you look at the hypotenuse of the second triangle made by the shapes it bends out slightly, allowing for the extra square to be available).

Kinda hard to explain, but i hope you all get the drift of what im saying.
;D ;D ;D ;D ;D