Question

In a building there are 24 cylindrical pillars the radius of each pillar is 28 cm and height is 4 metre find the total cost of painting the curved surface area of all pillars @ rupees 8 per metre square

Answer 1

Cost of painting 24 cylindrical pillars is Rs. 1350.4

Step-by-step explanation:

Given :

Height of each pillar = 4 m

Radius of each pillar = 27 cm = $\frac{28}{100} = 0.28 \text{m}$

Curved Surface Area of 1 Pillar

Curved Surface Area = 2πrh

                                  = 2 x 3.14 x .28 x 4

                                 = 7.0336 m²

Total number of pillars = 24

Total curved surface area of 24 pillars = 24 x  7.0336 m² = 168.8

Cost of painting is Rs. 8 per m²

∴ Total cost of painting = 168.8 x 8 =  Rs. 1350.4

To Learn More.....

1. The curved surface area of a right circular cylinder of base radius 3cm is 94.2cm^2.The volume (in cm^3) of the cylinder is ?(take pi = 3.14)​

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2. Find the curved surface area and total surface area of the each of the following right circular cones

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