With this ruler cutting pyramid shapes (Equilateral Triangles) is a snap.
All the math is done for you.
The Fons & Porter Pyramid Ruler is designed to cut finished triangles from 1in to 6in tall.
Simply cut a fabric strip, then cut the equilateral triangles from the strip using the marked lines on the ruler that correspond to your finished block size.
Each side of this template measures 7-7/8in.
Center line measures 6-1/2in.
Also included is an instruction sheet with detailed photography and design suggestions.