The diameter of the moon is approximately one-fourth of the diameter of the earth.What fraction of the volume of the earth is the volume of the moon?
dm=14de........(i)
⇒volume of earth
=43π×(de2)3
⇒volume of moon
=43π×(dm2)3
so fraction
=43π(dm2)343π(de2)3
=(dmde)3=(14)3=164........from (i)