A cylindrical pillar is 50cm in diameter and 3.5 cm in height. Find the cost of painting the curved surface of the pillar at the rate of Rs. 10 per m2
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Answer:
Answer is Rs. 55
Step-by-step explanation:
Height of cylindrical pillar (h) = 3.5 m
Radius of circular end of pillar ( r) = 50/2cm
= 25 cm
= 0.25 m [As radius = half of the diameter] and [1 m = 100 cm]
Curved surface area of cylindrical pillar = 2πrh
= 2 x 3.14 x 0.25 x 3.5
= 5.5 Curved surface area of cylindrical pillar is 5.5 m.
Cost of whitewashing 1m² is Rs 10
Cost of whitewashing 5.5 m² area = Rs. 10 x 5.5
= Rs . 55
Thus the cost of whitewashing the pillar is Rs 55
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