What size block do I need to cut out to make a half square triangle to make the FINISHED size 10". Thank you B.
Answer If you mean that you want to produce 10" finished half-square triangles from cutting out squares which you put right sides together and stitch 1/4" to either side of the diagonal line cutting through the square from corner to corner, . . . you will need to use 10 7/8" squares.
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