a circular hall has an inner diameter of 28 metres. if its height is 9 metres then find the cost of painting the inside walls of the hall if the rate is Rs 20 per square metre ?
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Diameter of the hall is = 28m.
Radius = 14m.
Height of the hall = 9m.
Then, area of the walls = surface area of a cylinder is = circumference of any one top circle * height of cylinder
=2 * pi * r * 9
= 2 * 22/7 * 14 * 9
=792 m2
Cost of painting 1 m2 = Rs. 20
Therefore, cost of painting the wall(surface area of the cylinder) = Rs.( 20 * 792) = Rs. 15840
Hence, the volume of the hall = volume of a cylinder = pi * r2 * height = (22/7 * 142 * 9) m3 = 5544 m3
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