(Q3) An Oil drum is in the shape of a cylinder having the following dimensions : diamter is 2m. and height is 7m. The painter charges ₹3 per m2 to paint the drum.Find the total charges to be paid to the painter for 10 drums ?

Solution :

2m7m

It is given that diameter of the cylinder(oil drum) = m

Radius of cylinder =
d
2
 =
2
 = m

Total Surface area of a cylindrical drum = 2πr(r + h)

  = ×
× ( + )
  = ×
×
=
m2 = m2

The total surface of a drum = m2

Painting charge per 1 m2 = ₹

Cost of painting of 10 drums = × × = ₹