The outer diameter of a spherical shell is 12 cm and its inner diameter is 8 cm. Find the volume of metal contained in the shell. Also, find its outer surface area.
Given,
Outer Diameter of spherical shell = 12cm
Radius of the outer sphere r1 = 6cm
Inner diameter of spherical shell = 8cm
Radius of the inner sphere r2 = 4cm
Volume of metal = outer volume – inner volume
= 
= 636.95cm3
Surface area of outer surface = 4πr2
= 
= 452.571cm2
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