The size of a shape is determined by the length of its edge, shown as distance "S" below. This makes matching of shapes very easy. A 1" hexagon goes with a 1" diamond, which goes with a 1" triangle, etc.
What a great layer cake pattern! Simple and really showcases and frames the prints! The possibilities are endless with a large selection of layer cakes and other pre-cuts to choose from at the Fabric Shack at http://www.fabricshack.com/cgi-bin/Store/store.cgi