A cylindrical pillar is 85 cm in diameter and 7 m in height. The cost of painting the curved surface of the pillar at the rate of Rs 20 per m2 is:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. ₹ 374.
Given:
Radius of pillar = 85/2 cm or (85/200) m
Height = 7 m
Formula used:
Curved surface of area cylinder = 2πrh ---- (1)
Calculations:
Using equation (1), we get
⇒ 2 × (22/7) × (85/200) × 7
⇒ 44 × 85/200
⇒ 18.7 m2
Required cost = 18.7 × 20 = ₹ 374