The internal and external diameters of a hollow hemispherical vessel are 24 cm and 25 cm respecttively. If the cost of painting 1 sq.cm of the surface area is Rs. 0.05, find the total cost of painting the vessel all over.
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internal radius=r=12
external radius=R=12.5
internal hemisphere c.s.a=2πr^2=288π
external hemisphere c.s.a=2πR^2=312.5π
path =π(R^2-r^2)
path= π*12.25
total area =288π+312.5π+12.25π
=612.75π
to convert sq.m=72.14π
cost=0.05*7214π=11.33rupess
external radius=R=12.5
internal hemisphere c.s.a=2πr^2=288π
external hemisphere c.s.a=2πR^2=312.5π
path =π(R^2-r^2)
path= π*12.25
total area =288π+312.5π+12.25π
=612.75π
to convert sq.m=72.14π
cost=0.05*7214π=11.33rupess
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