Question

In a building there are 24 cylindrical pillars the radius of each pillar is 28 cm and height is 4 m find the total cost of painting the curved surface area of all pillar at the cost Rs 10 per m^2

Answer 1

Answer:

Step-by-step explanation:

Radius=28/100m

Curved surface area of 1 cylindrical pillar= 2πrh

=2×22/7×28/100×4=176/25m²

Area of 24 pillars=176/25×24=4224/25m²

                      Cost of painting(₹ )        Area to paint(m²)

                                10                                        1

                                ?                                      4224/25

By cross- multiplication,

4224/25×10=1689.6

Thus, cost of painting=₹1689.6