A 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 Rs 12 per
, what will be the cost of painting all these cones? (Use
and take
)
Solution:
Base diameter of each cone
cm
Base radius of each cone
cm
m = 0.2 m
Height of each cone
m
Slant height of each cone
m
Curved Surface area of 1 cone
Curved Surface area of 50 cones
Cost of painting 1
of curved surface area = Rs 12
Cost of painting 32.028
of curved surface area
Rs 384.336
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