Question

canvas required to m
.
7. A bus stop is barricated from the remaining part of the road by using
50 hollow cones made of recycled cardboard. Each one 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 25 per m', what will be the
cost of painting all these cones? (Use n = 3.14 and V1.04 = 1.02.)
curved surface area and the total surface are​

Answer 1

Answer:

Curved surface area of cone will be painted=πrl

h=1m;radius=

2

40

=20cm=0.2m

and let l be the slant height,

∴l

2

=h

2

+r

2

=1

2

+0.2

2

⇒l=

1+0.04

=

1

.04=1.02m (∵

1

.04=1.02 is given in the question)

⇒Curved surface area of 1 cone=πrl=(3.14×0.2×1.02)m

2

=0.64046m

2

⇒ Curved surface area of 50 cones=50×0.64046=32.028m

2

Cost of painting 1m

2

=Rs.12

∴ Cost of painting 32.028m

2

=(12×32.028)=384.336m

2

≈384.34

∴ Cost of painting 50 cones is Rs.384.84

Step-by-step explanation:

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