The diameter of the moon is approximately one fourth of the diameter of the earth. Find the ratio of their surface areas.

Explanation

Both the moon and earth are in the shape of spheres.
Surface area of a sphere of radius `r =4pir^2`


Let `d_1` be the diameter of the moon and `d_2` be the diameter of the earth.


Let `r_1` be the radius of the moon and `r_2` be the radius of the earth.


Given `d_1=1/4d_2`

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