The roof of a circular room is hemispherical in shape with its inner circumference 35.2 m.find the cost of polishing inner surface area of the roof at the rate of rupees 2per 100cm².
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curved surface area of hemispherical shell is 2πr^2 .
and value of 2πr = 35.2
calculate r from it and put it in above eq.
for the cost multiply the surface area with the rate(0.02 rupees per meter square)
please follow me , for detailed answer and for more tricks
and value of 2πr = 35.2
calculate r from it and put it in above eq.
for the cost multiply the surface area with the rate(0.02 rupees per meter square)
please follow me , for detailed answer and for more tricks
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