Quilting Tips: Setting Triangles

When you position quilt blocks on point (also called a diagonal set), you need to fill in the outer edges of the quilt with triangle-shaped cuts of fabric. Triangles along the side of the quilt are called side setting triangles. Corner setting triangles fit the corners of the quilt.

Blocks set on point

To calculate the size to cut the side setting triangles:

  1. Multiply the finished size of your block by 1.414
  2. Add 1 1/4″ to that number
  3. Cut a square equal to the sum
  4. Cut the square twice, corner to corner

Example for a 6″ block:

6″ x 1.414 = 8.484 (round up to 8 1/2″)

8 1/2″ + 1 1/4″ = 9 3/4″

Cut a square 9 3/4″ and cut it twice, corner to corner.

Use quarter square triangles for side setting triangles.

To calculate the size to cut corner setting triangles:

  1. Divide the finished size of your block by 1.414
  2. Add 7/8″ to that number.
  3. Cut a square equal to the sum
  4. Cut the square once, corner to corner

Example for a 6″ block:

6″ ÷ 1.414 = 4.24″ (round up to 4 1/4″)

4 1/4″ + 7/8″ = 5 1/8″

Cut a square 5 1/8″ and cut it once, corner to corner.

Use half square triangles for corner setting triangles.

Happy Quilting,

The Tech Editors

Piecing Tips and Tricks Tool from C&T PublishingThis tutorial is an excerpt from Sharyn Craig‘s portion of the Piecing Tips and Tricks Tool.

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