The diameter of the moon is approximately one fourth of the diameter of the earth. Find the ratio of their surface areas.
Surface area of a shephe = 4πr2
Ratio of surface areas of spheres = square of ratio of their radius
Given, diameter of the moon is approximately one fourth of the diameter of the earth
∴ rm = 1/4 × re
⇒ rm : re = 1 : 4
Ratio of their surface area = 1 : 16