The diameter of the moon is approximately one fourth of the diameter of the earth. Find the ratio of their surface areas.
Let the diameter of earth be r and that of the moon will be r/4
Radius of the earth = r/2
Radius of the moon = r/8
Ratio of their surface area = 4π(r/8)2/4π(r/2)2
= 4/64 = 1/16
Thus, the ratio of their surface areas is 1:16