spheres a and b have their radil 40 cm and 10 cm respectively . the ratio of the surface area of a to the surface area of b is
solution let the radil of a and b be r and r respectively . required ratio = 4 π r 2 / 4 π r 2 ‹ = › r 2 / r 2 ‹ = › ( r / r ) 2 ‹ = › ( 40 / 10 ) 2 ‹ = › 16 : 1 . answer d
divide(surface_sphere(40), surface_sphere(10))