Now move your tape up to the 5" mark and measure across 7" and mark - check that it measures 5" from that mark straight down to the 7" mark on the edge (mine was spot on!) If not just adjust.
I then folded to join the dots
and cut along the folds to get my 7" x 5" rectangle
I can now use my 'pattern' to cut a rectangle from each of the fabrics. (note that you cut the piece from an edge not the centre of your fat 1/4 )
I am going to trim closer by curving slightly - take care not to cut the stitching. If you do, just go and restitch it in a little further.
Roll between your thumb and fingers and press remembering to press the seams in where you left the opening.