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26/07/2021 11:48 am
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A cylindrical pillar is 50 cm in diameter and 3.5 m in height. Find the cost of painting the curved surface of the pillar at the rate of Rs. 12.50 per m2.
(Assume π = 22/7)
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26/07/2021 11:50 am
Let h be the height of a cylindrical pillar and r be the radius.
Given:
Height cylindrical pillar = h = 3.5 m
Radius of the circular end of pillar = r
= diameter/2 = 50/2
= 25cm = 0.25m
CSA of pillar = 2πrh
= 2 × (22/7) × 0.25 × 3.5
= 5.5 m2
Cost of painting 1 m2 area = Rs. 12.50
Cost of painting 5.5 m2 area = Rs (5.5 × 12.50)
= Rs. 68.75
Therefore, the cost of painting the curved surface of the pillar at the rate of Rs. 12.50 per m2 is Rs 68.75.