Question

Bus stop is barricaded from the remaining part of the road, by using 50 hollow cones made of recycled cardboard. Each cone has a base diameter of 40 cm and height 1 m. If the outer side of each of the cones is to be painted and the cost of painting is 12 per m2 , what will be the cost of painting all these cones? (use π = 3.14 and take 1.04 = 1.02)

Answer 1

Cost of painting 50 cones is Rs. 384.33

Step-by-step explanation:

Given :

Height of cone = 1 m

Base Diameter = 40 cm

∴ Radius  = $\frac{40}{2} = 20 \text{cm}$

                       = .2 m

Consider l as the slant height

l² = h² + r²

l²   = (1)² + (0.2)²

l² = 1 + 0.04 = 1.04

Taking square toot on both sides we get,

l = √1.04 = 1.02 m

Curved surface area of 1 cone = πrl

                                                   = 3.14 x 0.2 x 1.02 m²

                                                   = 0.64056 m²

Total curved surface area of 50 cones = 50 x 0.63056 = 32.028 m²

Cost of painting = 12 per m²

Total cost of painting 50 cones = 12 x 32.028 = Rs. 384.33

To Learn More....

1. Yhe total surface area of cone is 71.28 cm2 find the volume of its cone if the diameter of base 5.6cm

https://brainly.in/question/8394949

2. The curved surface area of cone is 670 CM square and its radius is 15 CM then its total surface area is

https://brainly.in/question/5064128

Answer 2

Answer:

hope it helps ☺️☺️☺️......