I have a star quilt that I use to hang in my office (66X66) that I made from a black line drawing that started out as a diagram in a book of applique. The only information was the outside size and that one of the blocks was 19" square. When I made it I took a blown up copy of the black line drawing and with my protractor and geometry... figured out the exact angle of every piece... (It was a gian pinwheel with stars on the ends)...lots and lots of angles. It took me over three hours to calculate all the angles. The quilt one Best of Theme in our LQS. When students complain about hating math... I tell them (truthfully) that it is not my favorite subject...but I am thankful everyday I had high school geometry -- or I would never have been able to make that quilt! :thumbup: