Determine how many square centimeters of paper are needed to make a label on a cylindrical can 45 cm tall with a circular base having diameter of 20 cm. Leave answer in terms of π.

a. 450π cm²

b. 4,500π cm²

c. 900π cm²

d. 9,000π cm²

c. To determine the area of the label, we will use the formula for the surface area of a cylinder, area = πdh, which excludes the bottom and top. Substituting d = 20 and h = 45, the area of the label is π(20)(45) or 900π cm². If you select a, you used an incorrect formula for area, area = πrh. If you select b, you used an incorrect formula for area, area = πr²h.