Find the cost of painting 10 pillars of diameter 17.5 m and height 20 m at the rate of Rs.11.20 per sq. m
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Answer:
Diameter=D=50 cm
Radius of cylinder =r=
2
D
=
2
50
cm=25 cm=0.25 m
Height of cylinder, h=3.5 m
Curved Surface Area of cylinder =2πrh
=2π(0.25×3.5) m
2
=5.5 m
2
Cost of painting per meter square =Rs. 12.50
Total cost of painting 5.5 m
2
=Rs. 12.50×5.5=Rs. 68.75
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