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The diameter of the moon is approximatel...

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

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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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