Question

4. A cylindrical pillar 50 cm in diameter and 3.5 cm in height. Find the cost of painting the curved surface of the pillar at the rate of ₹ 12.50 per m2.​

Answer 1

Answer:

A cylindrical pillar is 50 cm in diameter and 3.5 m in height. Find the cost of painting the curved surface of the pillar at the rate of र 12.50 per m2. = र 5.5 x 12.50 = र 68.75.

Answer 2

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Given:

H=3.5 m ,

R= 50 / 2 =25 cm

= 25/100 =0.25 m

⇒ CSA = 2πrh= (2× 22/ 7 × 0.25 × 3.5 ) m²

=5.5 m²

⇒Cost of painting 1 m²

area = Rs.12.50

⇒Cost of painting 5.5 m²

area

= Rs.5.5×12.50

= Rs.68.75

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