Question

In a marriage hall there are 15 cylindrical pillars. The radius of each pillar is 18 cm and height is 3 m. find the total cost of painting the curved surface area of all pillars at the rate of Rs 5 per m ^ ​

Answer 1

Answer:

The cost of painting all the pillars are is ₹254.34

Explanation:

Question says that,

A marriage hall having 15 cylindrical pillars of dimensions :

• radius 18cm and
• height 3m.

Find the cost of painting the curved surface area of all pillars at the rate of ₹5 per m².

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Curved surface area of a cylinder is given by :

→ 2πrh

• r (radius) = 18cm or, 0.18m
• h (height) = 3m.
• Taking ‘π’ as 3.14

So,

→ 2 × 3.14 × 0.18 × 3

→ 3.3912m²

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Curved surface area of 15 such pillars :

→ 15 × 3.3912

→ 50.868m²

∵ 1 m² costs ₹5 for the painting

∴ 50.868m² will cost : 50.868 × 5

= ₹254.34

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