What is the surface area of a cylinder with the height of 32ft and the radius of 15 ft?

Answer 1

This surface can be divided into three parts: the curved surface of the side, which can be unrolled to form a rectangle, and the flat circular bases at each end. The area of each base is pi times the square of the radius, or 225 pi square feet, so the two of them add up to 450 pi sq. ft. The rectangle is 32 ft. by the circumference of each base (2 pi times the radius, or 30 pi feet), so its area is 960 pi sq. ft. Altogether the surface area is thus 1410 pi sq. ft., which works out to 4,429.7 sq. ft., rounded to 5 significant digits.