In a roll of aluminum foil, the inner cardboard tube has a diameter of 1.75 inches and a height of 18 inches I the tube is cut and unfolded to form a rectangle, what is the lateral area?
The "width" of the rectangle would be the "circumference" of the tube whereas the length is merely the height of the tube. . Therefore, we have: length = 11 inches width = 2(pi)r = 2(3.14)(1.7) = 2(3.14)(1.7/2) width = (3.14)(1.7) . area of rectangle = length * width area of rectangle = 11(3.14)(1.7) = 58.718 square inches
