Originally Posted by becca1231
I need to make a nine patch block that finishes at 6.5 inches. The four corners of the nine patch are half square triangles. What size do I cut the squares and the triangles? Thanks for any help you can give me.
Are you sure you need a _finished_ size of 6.5? Or do you need the block to be 6.5 inches before it's sewn into a quilt? The block is always unfinished. It's not finished until it's sewn into a quilt. So a finished block of 6 inches is 6.5 before it's sewn into a quilt. A finished block of 6.5 inches would be 7 inches before it's sewn into a quilt.
If you need a 6 inch finished block it's 6 divided by 3 plus a half inch seam allowance for the squares. Which would be squares of 2.5. For the half square triangles add an inch to the size you need, in this case 2 inches plus an inch, and then square up to 2.5 before you sew into the block.