The half square triangle is a building block for many
more complex blocks. It can also be used in borders and by itself to make
many amazing designs.
One of my favorite way to make half square triangles makes four at a time.
Determine the minimum size of the squares by using the
Half Square Triangle Calculator
Cutting your squares a little larger than
the minumum makes everything easier and allows you to be more accurate. I
usually round up to the next half or whole inch.
Stack the two square right sides together
Sew a 1/4 inch seam around the edge
Cut diagonally in both directions to create 4 half
Press seam toward the darker fabric or press the seam open.
Square up the patches to the finished size plus 1/2. For example for a 6 inch
finished square trim to 6 1/2 inches.
To square up the block, use a ruler with a 45 degree line. Align the 45
degree line with the diagonal seam on the block. Trim the edges to the proper size.
If you made the starting squares a little oversized, there will
be more waste at this point. However, there is less chance that the half
square triangle will be too small!