A cylinder pipe whose diameter is 28 cm and heights is 30 cm. find the cost to paint curved surface Rs 3 per cm
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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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