Question

The diameter of the base of a cylindrical pillar is 40 cm and its height is 3 m. Find the cost of
whitewashing its curved surface at the rate of 26.50 per sq m.​

Answer 1

Answer:

radius of base of cylinder = 40 / 2

= 20cm = 0.2 m

height = 3 m

C. S. A of cylinder = 2πrh

= 2 × 22/7 × 0.2 × 3

= 3.77m²

cost of whitewashing = 3.77 × 26.50

= 99.90 rs ( approx)

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