The corner triangles are an 8.5" square, cut on a diagonal. 2 of those make 4 corners. And the side/top triangles are 15 3/8" cut on the diagonal to make 10 from 5 squares.
I'll have to go look where you got 7 inches from. (are those for the boarder patches?)
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Ok, I found it....it is fabric requirement. ie they want you to buy 7" of dark purple fabric to make all the corner stone in the quilt. Each cornerstone measures 2.5" square, and the edge cornerstones are cut bigger because they want you to put triangles cornerstones around the edges.
Last edited by Jane Quilter; 09-04-2017 at 06:20 PM.