Quilt block diagram

Shoo fly quilt block

Four corner triangles and a strong center square make a spacious, highly readable nine-patch block.

Block structure

How the geometry is organized

A 3 × 3 grid with half-square-triangle corners, plain side squares, and one contrasting center.

  1. 1Prepare four equal corner triangle units.
  2. 2Place the same accent fabric in the center.
  3. 3Rotate each corner so its accent triangle points toward the center square.
Repeat this block

Finished-size planning

Basic unit sizes

These values divide the finished block evenly for drawing and layout. They do not include seam allowance or method-specific trimming.

6 in block2 in unit
8 in block2.67 in unit
9 in block3 in unit
10 in block3.33 in unit
12 in block4 in unit