Take the annoyance out of creating quilt blocks that contain triangle shapes. Nancy demonstrates how to make no-hassle ½-square triangles using speedy, accurate, no-math ways.

Learn to make no-hassle ¼-square and modified ¼-square triangles, cutting only squares. Make ¼-square and ½-square triangles without cutting a single triangle! Learn to make ¼-square ...

Zalman Usiskin, Perfect Square Patterns in the Pascal Triangle, Mathematics Magazine, Vol. 46, No. 4 (Sep., 1973), pp. 203-208 ...