The friendship star block is made of 5 fabric squares and 4 half square triangle units. This tutorial is for a 12-inch block. As always, I have created a printable pattern.

This variation uses half-square triangles in the corner squares instead of squares. If you want to make the classic sawtooth star, I have a tutorial for that too.

Nancy shows how to arrange simple half-square triangles into beautiful row-by-row designs.