a cylindrical pillar is 50cm in diameterdiameter 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 m^2.
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Answer:
Given:
H=3.5 m
R= 50/2 =25 cm = 25/100 = 0.25m
Step-by-step explanation:
⇒CSA=2πrh=2(22/7×0.25×3.5)
⇒CSA=5.5cm²
⇒Cost of painting 1 m²area = Rs.12.50
⇒Cost of painting 5.5 m² area = Rs.5.5×12.50
⇒Cost of painting 5.5 m² area = Rs.68.75
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