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 ₹ 12 per m², what will be the cost of painting all these cones? (Use π = 3.14 and take √11.04 = 1.02).
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Answer:
r=d/2
r=20 cm = 0.2m
so find l by √r²+h²
CSA=πrl
l=0.64056
CSA=32.028
cost of painting 1 m²= 12
=32.028×50=384.34
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