Originally Posted by
Holice
Is the Tri-Rec a 60 degree triangle. If so it will work.
Yes, has to be. It is an equilateral triangle (meaning all angles are equal). The angles of a triangle must add up to 180 degrees - 3 equal angles are 60 degrees each.
Its companion shown in the link is a right triangle. One 90 degree angle and two 45 degree angles.
I actually am math challenged but had to bone up on triangles for quilting and for teaching GED Math!