Question

.Find the cost of painting the curved surface of a cylinder of base diameter 35 cm and height 20 cm at the rate of 20 paise per cm2.​

Answer 1

Answer:

₹3,850

Explanation:

Since, Volume of the painting is = 22/7 ×(35/2)²×20

=19250cm²

Since, rate per cm² = 20paise

Therefore, Rate of the painting = 19250×20 paise

= 3,85,000 paise

Therefore price in rupee = 3,85,000/100

= ₹3,850

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Answer 2

Explanation:

Given length or height of pillar =3.5m

Radius of each pillar =36cm

CSA of pillar =2πrh=2π×0.36×3.5

CSA=7.91m²

Now total area to be painted =7.91×20

Total Area =158.20m²

Cost of painting =158.20×3=474.60.

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