The height of a cylinder is equal to its diameter. What fraction of the surface area of the cylinder is the total area of the two bases?
Surface area of cylinder = 2pi * r * (2r) = 4 pi r^2
Area of the two bases = 2 pi *r^2
Area of two bases / Surface area of cylinder = [ 2 pi r^2 ] / [ 4 pi r^2] = 1 / 2