Question

A cylinderical pillar is 1.6m in diameter and 6.3m in height. Find the cost of white washing the
curved surface of the pillar at the rate of 12 per m².

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Answer 1

${\huge{\bold{\underline{Answer:-}}}}$

Hi,

Dimensions of the cylinder Piller is

Diameter = d = 1 m

Radius ( r )= d / 2 = 1 / 2 m

Height = h = 4.2 m

Curved surface area of the cylinder

C.S.A = 2πrh

= 2 × 22 / 7 × 1 / 2 × 4.2

= 13.2 square meters

Cost of white washing the CSA of

Piller per square meter = Rs 15

Cost of white washing the 13.2m Piller

= 13.2 × 15

= Rs 198

I hope this helps you.

:)