What are Half Square Triangles? It is a square that is made up of 2 equal
triangles. These squares are the basis for many quilt block patterns. There are
various ways to make them and this method is just one variation.
- Choose two different fabrics to make your Half Square Triangles. This
method will produce two squares at a time. Great! Two for one! These squares
need to be cut 7/8 larger than your finished block size. If you need a 4 finished square,
add 7/8 to that measurement. This includes seam allowances, and includes compensation
for the triangle angles. Read
for further clarification
of the amount to add to your finished square size.
- On the wrong side of one square draw a diagonal line from one corner to the opposite corner.
Choose either the lighter square to draw on, or write with a pencil or marker that will show up on your
- Place your two squares right sides together; making sure that the square with the diagonal
line drawn on it is on top, so you can see it.
- Sew ¼ on either side of the drawn line. Hint: Mark these two ¼" lines on either side of the
center diagonal line. It will make it easier to sew.
- Cut on the center diagonal line and press seam toward the light fabric.
- You now have two Half Square Triangle Squares.
- Cut off the little ears or points that stick out. See above illustration.
©2005 Dori Hawks