Originally Posted by Holice
I'm glad I took too Aleve because all this makes my head hurt. To begin with there does not appear to be complete information. However, in rereading your original post which says you cut a square of 4 7/8 inches and then cut the square into a triangle. My quiltmaking knowledge tells me that the intention is to sew two of the triangls together back into a square. With the 7/8" the assumption is that you are going to sew them together with an accurate 1/4" or scant 1/4" seam which will make your square 4.5".
Just to clarify, this will make a finished square of 4" - unfinished it will be 4.5".
If you look at her illustration, what she's doing is taking half square triangles and sewing four of them into a square.