Question

in a building there are 25 kal pillar the radius of each pillar is 50 cm and height 5 metre find the cost of painting cut surfac area of pillars at the rate of rupees 75 square metre ki​

Answer 1

Answer:

We have,  

r= radius of cylindrical pillar =28 cm=10028m

h= height of cylindrical pillar =4 m

∴ curved surface area of a cylindrical pillar = 2πrh=2×722×10028×4cm2

∴ Curved surface area of 25 pillar = 2×722×10028×4×25m2=176m2

Hence, total cost of painting at the rate of Rs 8per m2=Rs(176×8)=Rs 1408