The outer diameter of a gas cylinder 20 cm . Find the cost of the painting of its outer curved surface at rs 4 per cm if the height of the cylinder is 70 cm .
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curved surface of cylinder = 2*pi*r*h
r=10 cm
h= 70
2*22/7*10*70
=4400
total cost of painting= 4*4400
17600
r=10 cm
h= 70
2*22/7*10*70
=4400
total cost of painting= 4*4400
17600
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