Question

a building is made of 24 cylindrical pillars the ratio radius of the pillar is 28 cm and height is 5 find the cost of whitewashing for the pillars at the rate of 10 rupees per metre .​

Answer 1

Answer:

Rs. 2112

Step-by-step explanation:

radius of the pillar = 28 cm = 0.28 m

Height of pillar = 5 m

CSA of pillar = 2πrh

⇒ 2 * 22/7 * 0.28 * 5

⇒ 8.8 m

Area of 24 pillars = 8.8 * 24

                             = 211.2 m²

Now,

cost of whitewashing per m² = 10

Total cost = 10 * 211.2 = 2112.

Therefore,

Cost of whitewashing = 2112.

Hope it helps!