A bus stop is barricaded from the remaining part of the road by using 50 hollow cones made up of recycled cardboard. Each cone has a diameter of 40cm and height 1m. If the outer side each of the cones is to be painted and the cost of painting is 12 rupee per meter square , what will be the cost of painting of all these cones?
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Answer:
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Step-by-step explanation:
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
by nivaskumar brainly app
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