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A spherical object has a diameter of 18 cm. It has a spherical inner core with a diameter of 9 cm. What is the volume of the outer layer?

Answer :

MissPhiladelphia
We do as follows:

[Entire sphere] - [Inner sphere] = Outer layer 
radius of Entire sphere = 9 cm 
radius of Inner sphere = 4.5 cm 

[(4/3)(3.14)(9)^3] - [(4/3)(3.14)(4.5)^3] 
= (3052.08) - (381.51) 
= 2670.57 cubic centimeters

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