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Sum
A cylindrical pillar has a radius of 21 cm and a height of 4 m. Find :
(i) the curved surface area of the pillar
(ii) cost of polishing 36 such cylindrical pillars at the rate of ₹ 12 per m2.
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Solution
Radius of the cylinder = 21 cm
= `21/100 = 2.1`m
Height of the cylinder = 4 m
(i) Curved surface area of the cylinder = `2pirh`
= `2 xx 22/7 xx 2.1 xx 4 = 52.8` m2
(ii) Cost of polishing 1 m2 = ₹ 12
Cost of polishing `(36 xx 52.8 "m"^2)`
= ₹ `12 xx 1900.80 = ₹ 22,809.60`
Concept: Surface Area of a Cuboid
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