An oil drum is in the shape of cylinder, whose diameter is 2 m and hei

1.	An oil drum is in the shape of cylinder, whose diameter is 2 m and height is 7 m. The painter charges ? ₹ 5 per m2 to paint the drum. Find the total charges to be paid to the painter for 10 drums.
Answer» It is given that diameter of the (oil drum) cylinder = 2 m. Radius of cylinder = \(\frac{d}{2}=\frac{2}{2}\) = 1 m. Total surface area of a cylindrical drum = 2πr(r + h) = 2 × \(\frac{22}{7}\) × 1(1 + 7) = 2 × \(\frac{22}{7}\) × 8 = \(\frac{352}{7}\)m² = 50.28 m² . So, the total surface area of a drum = 50.28 m² Painting charge per 1 m² = ₹ 5. Cost of painting of 10 drums = 50.28 × 5 × 10 = ₹ 2514

An oil drum is in the shape of cylinder, whose diameter is 2 m and height is 7 m. The painter charges ? ₹ 5 per m2 to paint the drum. Find the total charges to be paid to the painter for 10 drums.

Answer»

It is given that diameter of the (oil drum) cylinder = 2 m.

Radius of cylinder = \(\frac{d}{2}=\frac{2}{2}\) = 1 m.

Total surface area of a cylindrical drum

= 2πr(r + h)

= 2 × \(\frac{22}{7}\) × 1(1 + 7)

= 2 × \(\frac{22}{7}\) × 8 = \(\frac{352}{7}\)m² = 50.28 m² .

So, the total surface area of a drum = 50.28 m²

Painting charge per 1 m² = ₹ 5.

Cost of painting of 10 drums

= 50.28 × 5 × 10

= ₹ 2514