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Exercise 13.4 Q7

Answer» Let the radius of the earth=rRadius of the moon=r/4Surface area of a sphere=4Πr2Since,the earth as well as moon are considered to be sphere.Surface area of earth=4Πr2Surface area of moon=4Π(r/4)2Surface area of earth /Surface area of moon=4Πr2/4Π(r/4)2=r2/(r/4)2=16r2/r2=16/1=16:1


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