Tetrahedral carton of milk Though very usually shaped like a cuboid, it is not uncommon to locate cartons missing ideal angles and straight edges, as in squrounds used for ice product. Vintage Gable Roof: A conventional gable roof with two equivalent sloping sides. b. Cross Gable Roof: A gable roof https://www.diigo.com/item/pdf/b5sxz/i5xk