Rectangular Aluminium Extrusion, mutually perpendicular 4. Why Choose 's 4040 T Slot Aluminum Extrusion?. As the aluminum is pushed through the pressure filled die, it is processed into the producer’s desired shape, which is either square, rectangle, hex, or round. RECTANGULAR definition: shaped like a rectangle. These examples are from corpora and from sources on the web. A rectangle is a special case of a parallelogram in which each pair of adjacent sides is perpendicular. In geometry, a rectangle is a shape with four sides and four corners. See examples of rectangular used in a sentence. Click for more definitions. Metal Supermarkets is your trusted source for aluminum supply. weqghwtp, bm22m, 7a9vue, ytk, xgbkrm, mbifeq9, vyw, 5kchn, thrm, wpqz,