Question

The diameter of the moon is appropriately one front of the diameter of the Earth. Find the ratio of their surface areas. ​

Answer 1

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

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