Originally Posted by
recycler
I believe what you want to do is multiply the size of half triangle square you want by 1.41, then add .5 to that figure to allow for the seam allowances. So, 2.75 times 1.41 equals 3.88. Add .5 which gives you 4.38. I would round up to 4.5. Give that a try....hopefully that helps?
That formula is for quarter square triangles. To get half square triangles you add 7/8" to the finished size.
Sharon in Texas