Thought I was not going to sleep tonight...between my husband and my friend Judi, we figured it out....it is like some kind of trapzoid...
you take the length of the angle, then take that same measurement to the bottom of fabric which will be horizontal and you mark it and cut a straight line. What a lesson...math....lols! I still feel that the hex shape will probably look better though...attached is what it looks like..have a good night all...