Question

7. Find the cost of painting the outside surface
of a solid cylinder of diameter 7 m and
height 20 m at 5 per sq. m.
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Answer 1

Answer:

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Answer 2

Answer :

• 2200 is the cost of painting

Given :

• Diameter = 7m
• Height = 20m at 5 per sq. m

To find :

• The cost of painting the outside surface of a solid cylinder

Solution :

First we need to find radius

Given Diameter = 7m

• Radius = D/2 = 7/2 = 3.5cm

And also Given,

• Height = 20cm

As we know that,

• Surface area of cylinder = 2πrh

Where, r is radius (3.5cm) and h is height (20cm)

》Surface area of cylinder = 2πrh

》2 × 22/7 × 3.5 × 20

》440 cm²

And also Given that ,

cost of painting is 5 per m²

》440 × 5

》 2200

Hence 2200 is the cost of painting