Question

cylindrical metal pipes are used to transport water they are each 6 metre long and are of diameter 70 cm how much will it cost to cote the curved surface of a pipe to keep it from rusting if it cost rupees 3.50 metre square plzz answer it the answer is rupees 46.20 but I don't know how plzz tell me

Answer 1

Given:

Height of cylindrical pipe h = 6 m.

Diameter of the cylindrical pipe = 70 cm = 0.7 m.

So, Radius of the cylindrical pipe r = d/2

                                                         = 0.7/2

                                                         = 0.35 m

We know that curved surface area of the pipe = 2πrh

⇒ 2 * (22/7) * (0.35) * 6

⇒ 2 * 0.05 * 22 * 6

⇒ 13.2.

∴ Cost of coating per m^2 = 3.50.

Then, Cost of coating 13.2 per m^2:

⇒ 3.50 * 13.2

⇒ 46.2.

Hope it helps!

Answer 2

Hope that this answer will help you