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 rs12.50 per m2
Radius of the pillar (r) = 50/2 cm = 25 cm = 0.25 m
Height of the pillar (h) = 3.5 m.
Rate of painting = rs12.50 per m2
Curved surface = 2πrh
= (2 × 22/7 × 0.25 × 3.5) m2
=5.5 m2
Total cost of painting = (5.5 × 12.5) = rs 68.75
