Question

Along the path 100 conical pillars are constructed each pillar has base radius 7 cm and height 24 cm find the total cost of painting these pillars at the rate of rupees 120 per cm²​

Answer 1

Answer:

Rs 1900.80

Step-by-step explanation:

Find the surface area of one pillar:

Area = 2πrh

Area = 2π(0.14)(0.18) = 0.1584 m²

Find the surface area of 100 pillars:

1 pillar =  0.1584 m²

100 pillar = 100 x  0.1584 = 15.84 m²

Find the cost:

1 m² = Rs 120

15.84 m² =  15.84 x 120 = Rs 1900.80

Answer: Rs 1900.80