Question

The curved surface of a cylindrical can of radius 9 cm and height 21 cm is to be painted. Find the cost of painting 5000 such identical cans at the rate of ₹3 per m2.

(Take 227 for π).

Answer 1

Explanation:

Length or height of pillar =3.5 m

Radius of each pillar =36 cm=0.36 m

Curved Surface Area of pillar =2πrh=2π×0.36×3.5 m

2

=7.91 m

2

Total area to be painted =7.91×20 m

2

=158.20 m

2

Cost of painting =Rs. 158.20×3=Rs. 474.60.

Answer 2

Answer:  Rupees 1782

Explanation:. The cost of painting 5000 such identical cans at the rate of ₹3 per m2 is rs 1782