Question

The outer diameter of a drainage pipe is 1m and it is 2m long. Find the cost of painting the outer surface of the pipe at the rate Rs. 5 per sq. m.

Answer 1

Step-by-step explanation:

Outer diameter = 1 m

Height = 21 m

To Find : Cost of painting pipe at the cost of rate of ₹5/m².

Solution :

First of all we have to find it's Curved surface area.

Curved surface area of a cylinder = 2πrh = πdh

= 66 m².

Now ,

Cost of painting 1 m² = 5

Cost of painting 66 m² = 5×66 = 330 .

The cost of painting the pipe is ₹330 .

Answer 2

Answer:

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