Cost of painting the curved surface area of a cylinder of height 4 metre at the rate of
rupees 10 per metre square is rupees 1760. Find total surface area of the cylinder.
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The formula of the outer surface area of the cylinder is 2πrh.
To know that outer surface area we need to evaluate it.
Given that d=7
∴r=
2
d
=
2
7
=3.5 cm
h=25 m
∴ outer surface area =2πrh
=2×
7
22
×3×5×25
=44×25×0.5
=550cm
2
since the cost of painting is 8 per cm
2
=550×8
= Rs. 4400.
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