Cutting 60-degree triangles from strips

To accommodate the seam allowance, cut the fabric strip as wide as the finished height of the triangle + ¾” for the seam allowance. As example, for a 4” high triangle, cut the fabric strip 4 ¾” wide.



RM-SG 18" X 24" Green Double-Sided, Self-Healing Rotary Mat


RM-MG 24" X 36" Green Double-Sided, Self-Healing Rotary Mat

45mm RTY-2/DX Ergonomic Rotary Cutter

QR-6x24 6" X 24" Frosted Acrylic Ruler

QR-6x12 6" X 12" Frosted Acrylic Ruler


  1. Square your fabric and cut a strip.
  2. Turn the strip horizontally on your cutting mat and square the end.
  3. Place the ruler on the strip, aligning the 60° line on your ruler along the horizonal edge of your strip. 
  4. Cut along the ruler edge from the bottom of the strip to the top. Save the cut off piece for scraps.
  5. Rotate the ruler so the opposite 60° line is aligned along the edge of the strip and cut. 
  6. Continue rotating the ruler until the triangles are cut. It’s more efficient to move the ruler than it is to move the fabric. 
  7. For smaller cuts, consider using an OLFA Rotating Self-Healing Mat.