Gary wrote:
http://www.nobeliefs.com/puzzles/triangle-puzzle.jpg

http://www.ebaumsworld.com/images/trigrid.gif

Rob

Easy to solve, by the way. Neither 4-color "triangle" is actually a
triangle. They are quadrilaterals. Look closely at the "long side",
which is actually two sides. The point where the two smaller triangles
meet along this "side", is actually an angle slightly less than 180
degrees in the upper drawing, and slightly more than 180 degrees in the
lower one.