The diameter of a cylindrical pillar is 60cm and height 4.2m. Find the cost of painting the curved surface of the pillar at the rate of Rs 65 per 10 meter square
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Given :-
- Diameter of Pillar = 60cm
- Height of pillar = 4.2m
- Cost of painting 10m² = Rs. 65
To Find :-
- The cost of painting the curved surface of the pillar at the rate
Solution :-
Height of pillar = 4.2m = 4.2 × 100 = 420cm
Diameter of pillar = 60cm
Radius of Pillar = D/2 = 60/2 = 30cm
C.S.A. of cylinder = 2πrh
=> 2 × 22/7 × 30 × 420
=> 2 × 22 × 30 × 60
=> 44 × 1800
=> 79200 cm²
=> 7.92m²
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