Question

A bus stop is barricaded from the remaining part of the road, by using 100 hollow's cones made of recycled cardboard. Each cone has a base diameter of 60 cm and height 2m. If the outer side of each of the cones is to be painted and the cost of painting is ₹ 12 per meter square , what will be the cost of painting all these cones? ( use π = 3.14 and take
$\sqrt{1.04} = 1.02$
​

Answer 1

Answer:

Given, r=

2

40

=20cm=0.2m

h=1m

l=

h

2

+r

2

=

1

2

+0.2

2

=

1.04

=1.02m

CSA =πrl=(3.14×0.2×1.02)m

2

=0.64m

2

CSA of 50 cones =50×0.64056

=32.028m

2

Cost of painting 1m

2

area =Rs.12

Cost of painting 32.026m

2

area =Rs.32.028×12

=Rs.384.336≈Rs.384.34

Answer 2

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