A cylindrical pillar is 50 cm in diameter and 3.5 m in height. Find th

1.	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 ]
Answer» Height (h) cylindrical pillar = 3.5 m Radius (r) of the circular end of pillar = 50/2 cm =25cm = 0.25m CSA of pillar = 2πrh = (2 x 22/7 x 0.25 x 3.5)m² = (44 x 0.125)m² = 5.5m² 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 CSA of the pillar is Rs 68.75.

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 ]

Answer»

Height (h) cylindrical pillar = 3.5 m

Radius (r) of the circular end of pillar

= 50/2 cm =25cm = 0.25m

CSA of pillar = 2πrh

= (2 x 22/7 x 0.25 x 3.5)m²

= (44 x 0.125)m² = 5.5m²

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 CSA of the pillar is Rs 68.75.