English, asked by kunaljoshi61, 3 months ago

In a building there are 24 cylindrical pillars. the radius of each pillar is 28 cm and heights is 4 m . find the total cost of painting the curved surface area of all Pillars at the rate of rupees 8 per meter square ?​

Answers

Answered by elenstudent365
4

Answer:

Rs 1351.68

Explanation:

Radius of cylindrical pillar, r = 28 cm = 0.28 m

height, h = 4 m

curved surface area of a cylinder = 2πrh

curved surface area of a pillar =2 × 22/7 × 0.28 × 4=7.04 m2

curved surface area of 24 such pillar = 7.04 × 24 = 168.96 m2

cost of painting an area of 1 m2 = Rs 8

Therefore, cost of painting 1689.6 m2 = 168.96 × 8 = Rs 1351.68.

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