A cylindrical pillar is 50 cm in diameter and 3m in height. Find the cost of painting the curved surface of the pillar at the rate of Rs.10 per square metres.
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QUESTION :
A cylindrical pillar is 50 cm in diameter and 3m in height. Find the cost of painting the curved surface of the pillar at the rate of Rs.10 per square metres.
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ANSWER :
Piller is in the form of cylinder
Curve surface area of piller is = 2πrh
Height if cylinder piller = 3m
Radius of the circular end of piller = 50/2=25m
➾ r =25 × 1/ 100m
➾ 0 . 25m
CURVE SURFACE AREA OF PILLER = 2πrh
➾ (2 × 22/7 × 0.25 × 3)
➾ 44×0.125
➾ 5.4m^2
_____________
Cost of painting 1 m ^2 = Rs. 10
Cost of painting 5.4m^2 area = Rs (5.4 ×10)
➾ Rs 54.0
Therefore , the cost of painting CSA of
the piller is Rs. 54 .
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