I want to make a baby quilt using a half-square triangle pattern, but I am not using pre-cuts. How do I figure out how big the ending squares will be when I sew two squares together and do either the 4-corner diagonal cut or the 2-corner diagonal cut??

For example, if I use 8" squares, sew the perimeters together, and cut twice through the center ending up with 4 half-square triangles, how big will the squares be?

Or if I sew twice down the middle, then cut inbetween those seams, how big will those 2 squares end up?

I can't figure this out in my head. What is the math formula for this?

For example, if I use 8" squares, sew the perimeters together, and cut twice through the center ending up with 4 half-square triangles, how big will the squares be?

Or if I sew twice down the middle, then cut inbetween those seams, how big will those 2 squares end up?

I can't figure this out in my head. What is the math formula for this?

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