Magic Half Square Ruler
For making halfsquare triangle blocks up to 6". All the math has been built into the ruler so you don't have to think about how much to add you only need to know the size of the finished block.
For making halfsquare triangle blocks up to 6". All the math has been built into the ruler so you don't have to think about how much to add you only need to know the size of the finished block.