the outer diameter of a pipe is 70 cm and it is 21 m long find the cost of painting the outer surface of the pipe @ rupees 10 per square metre
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d = 70cm
r= 70 / 2 = 35 cm
= 0.35m
h = 21 m
area = 2πrh
= 2 × 22/7×0.35× 21
= 2 × 22×0.35×3
= 2 × 23.1m^2
=46.2m^2
Total cost of painting = 46.2m^2 × 10
= ₹462
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