Question

the outer radius of a pipe is 35 cm and it is 21 metre long find the cost of painting the outer surface of the pipe 25 per square metre​

Answer 1

Answer:

Total surface area(T.S.A) = 123.20m²

Cost of painting = Rs. 3020

Step-by-step explanation:

→ The outer Radius of pipe = 35 cm

→ The length of pipe = 21 m

→ Cost of painting of pipe = 25 per m²

:- Pipe is in the shape of cylinder.

Now,

To find the area of total outer surface of pipe which is to be painted, we need to find the T.S.A of the pipe.

So,

T.S.A of cylinder = 2πrh + 2πr2

=(2×22/7×35×21)+(2×22/7×35×35)

= 4620 + 7700

= 12,320 cm²

= 123.20 m²

Hence, cost of painting of cylinder = 123.20 × 25

= Rs. 3020

Hope it is helpful to you.

Please mark my answer as brainliest...

Answer 2

Answer:

please mark my answer in brainliest