The outer diameter of a pipe is 1m and and it is 21 m long. the cost of painting the outer surface of the pipe @ rupees 5 per square metre is
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diameter of base = 1m
radius = 0.5 m
height = 21 m
Curved surface area of pipe = 2 × PY × radius × height
= 2× 22/7 × 0.5 × 21
= 66m square
So cost of painting the pipe = 66×5
= 330 rupees
radius = 0.5 m
height = 21 m
Curved surface area of pipe = 2 × PY × radius × height
= 2× 22/7 × 0.5 × 21
= 66m square
So cost of painting the pipe = 66×5
= 330 rupees
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