When companies sell products, the use materials, to create the product, and to encase it The less material they lose, the more money they save, so minimizing surface area is extremely important in economics This Simpsons Soundtrack is in a Donut Case this has more surface area than a regular square shaped CD-case This is a company that manufactures baskets Approximating its shape to be a rectangle: 100 m 50 m 70 m Surface Area = Area of All Sides = 2 x (area of front) + 2 x (area of side) + 2 x (area of top) = 2(l x h) + 2(w x h) + 2(l x w) = 2(100 x 70) + 2(50 x 70) + 2(100 x 50) = 2(7000) + 2(3500) + 2(5000) = = m 2 Leaning Tower of Pisa Approximating its shape to be a (straight) cylinder: Radius = 4 m Height = 20 m p. 32 #5, 8, 9, 11, 13