A cylindrical pillar is 50 cm in diameter and 3.5 m in height. Find the cost of painting the covered surface of the pillar at the rate ₹ 10 per sq m .?
Correct Answer: ₹ 55
Explanation:
Curved surface area = 2πrh
= 2 x (22/7) x 0.25 x 3.5
= 5.5 sq m
∴ Cost of painting 5.5 sq m = 10 x 5.5
= ₹ 55
