Question

Along a path, 100 conical pillars are constructed. Each pillar has base radius 14 cm and height 18 cm. Fin the total cost of painting these pillars at the rate of Rs.120 per Sq.m.​( Take pie = 22/7 )

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