Question

the radius of a piller is 28cm height is 4m find the total cost of painting the curved surface area of piller at the rate of 9 Rupee's per m square

Answer 1

$<b>Heya mate. (^_-). Solution below.$
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• Since the shape of the pillar is not given, we assume that the pillar is cylindrical in shape.


• Radius of the pillar = 28 cm

• Height of the pillar = 4 m = 400 cm


• Then,

Curved surface area of the pillar

= 2 × π × radius × height

= 2 × 22/7 × 28 × 400

= 2 × 22 × 4 × 400

= 44 × 1600

= 70400 cm²

= 7.04 m²


• Hence, the curved surface area of the pillar = 7.04 m²



• Now, cost of painting 1 m² = 9 Rs.

So, cost of painting 7.04 m² =

7.04 × 9

= 63.36 Rs.

$<marquee>Hence, your answer is 63.36 Rs.</marquee>$
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Thank you.. ;-)