Tài liệu tham khảo về cách xếp hình, Chia tỷ lệ khi xếp hình. | Making Letter Sized Proportion Rectangle from Square Method I 1 4 3 Cut along horizontal line through point C 1997 Sy Chen C A B 47x60 rectangle difference from letter size proportion 4 Completed paper 5 Make crease passing C and E 6 Crease passing AF G is the intersection of AF CE 7 Cut along vertical line through point G difference from letter size proportion 8 .