Triangles are such a common shape used in quilts. There is a simple method to determine the size to cut the shape so it fits in the quilt top.
For Half-Square Triangles:
These triangles are commonly used to make corner setting triangles when the blocks in the quilt top are set on point. They also form the basis for many quilt block patterns. Typically, the straight of grain of the fabric is on both short sides. To obtain 2 triangles, cut a square in half diagonally.
The cut square size = the finished size of a short triangles side + 7/8”.
For Quarter-Square Triangles:
These triangles are commonly used to make side setting triangles used when the quilt blocks are set on point. They also form the basis of many quilt block patterns. The straight of grain of the fabric is typically on the long triangle side. To obtain 4 triangles, cut a square twice diagonally.
The cut square size = the finished size of the long triangle side + 1 1/4”.
Happy Quilting.
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One Comment
Awkward working there guys. If you set an on point quilt with half square triangles you will have quite a mess on your hands.Measure the diagonal of the finished block to be set on point, add 1.25" cut a 1/4 square triangle and you are on the right track.
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Triangle Man, Triangle Man…
I used to think triangles were intimidating … until I tried to actually make them for a quilt top! Now I think they’re fun – and it’s a good thing, too – it seems like most blocks use half-square or……