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. See Making Half Square Triangles: Method 1.

1. 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 Quilt Math: Magic Numbers for further clarification of the amount to add to your finished square size.



2. 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 fabric.




3. 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.



4. 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.


 


5. Cut on the center diagonal line and press seam toward the light fabric.

 


6. You now have two Half Square Triangle Squares.





7. Cut off the little “ears” or points that stick out. See above illustration.

©2005 Dori Hawks
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