Half-Square & Quarter Square Triangles Ruler
For Half-Square Triangle
1. Cut fabric to desired size squares. A fabric square
ending in 7/8” will yield a squared block ending
in 1/2”. For example, cut fabric in 3-7/8” squares
a 3-1/2” squared block.
2. Layer two squares of fabric right sides together.
3. Begin by using the left side of your ruler for marking.
Position solid line so it goes
from corner to corner of your layered squares. Using
a fabric marking pen, mark stitching lines using the
two slots on either side of the solid line.
4. Sew squares together on the marked stitching lines.
5. Now work off the right side of your ruler for cutting.
Center stitched square under the ruler so that the dotted
lines on the ruler line up with stitched lines on square.
The cutting slot should be centered corner to corner.
Using a rotary cutter, cut in cutting slot.
6. Press seam toward the darker fabric and press top
7. Lastly, work in the center section of the ruler.
Align the block seam with the 45° ruler markings.
Center the block top and bottom and side to side with
horizontal lines and cutting slots. Cut in appropriate
vertical cutting slot.
For Quarter-Square Triangle
Follow instructions for creating half-square triangles.
Note: Quarter-square triangle blocks will square one
inch smaller than the half-square triangle blocks. For
example: If you begin with 4-1/2” half-square triangle
blocks, your completed quarter-square triangle block
will square up at 3-1/2”.
Layer two half-square triangles, right sides together.
Take note of the fabric positions that fabric colors
will appear as desired when finished.
Follow steps 3 through 8 for Half-Square Triangle Blocks
to complete your
Quarter-Square Triangle blocks.