A conical-shaped vessel has a radius of 21 cm and a slant height of 25 cm. If the curved part of the vessel is to be painted white, find the cost (in ₹) of painting at the rate of ₹1.5 per cm2 .
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 2475.
Radius = 21 cm
Slant height = 25 cm
Cost of painting = Rs 1.5 per cm2
The curved surface area of the cone = πrl
Where, r = radius and l = slant height
CSA of cone = (22/7) × 21 × 25 = 1650 cm2
Required cost of painting = 1650 × 1.5 = Rs 2475