Question 152758
The inside radius of a spherical metal shell is 50cm and the thickness of the shell is 0.4cm. Calculate the volume of the material used in the shell to the nearest unit. 
The formula for volume of a sphere is 4/3 pi r^3 so is the answer 4/3 pi 50^3 = 523333.33 or do I have to do something with the 0.4cm thickness? 
Thanks
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Calculate the total volum of the sphere, then subtract the volume of a sphere 0.4 cm smaller radius.
Vol of material = {{{4*PI*50.4^3/3 - 4*PI*50^3/3}}}
= {{{(4*PI/3)*(50.4^3 - 50^3)}}}
= 12,667 cc (cubic cm)