Question

The radius of a cylindrical pipe is 28cm and height is 4cm. Find the cost of painting the curved surface area of the pipe at the rate of ₹8 per m².

Answer 1

Answer:

₹5.632

Step-by-step explanation:

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Radius = 28 cm

Height = 4 cm

Curved Surface Area of a Cylinder = 2πrh

Now,

CSA = 2*π*28*4

        = 2*22/7*28*4

        (We can divide 28/7 = 4)

         = 2*22*4*4

         = 704 cm²

Since,

The cost of painting the pipe =  ₹8m²

So,

We need to convert cm² to m²

1 cm² = 1/10000 m² = 0.0001 m²

704 cm² = 704*0.0001 m²

              = 0.0704 m²

Now, the total cost of painting = 8*0.0704 = 5.632

                                                   = ₹5.632