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 at the rate of 10 Rs per square metre?
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Answered by
5
We have,
Height of pipe=21cm
Diameter of the Pipe=70cm=0.7
We know that,
Curved surface area of cylinder=(pi×d×h) or (2×pi×r×h) sq. unit
C.S.A=(22÷7×0.7×21)m^2
=46.2m^2
cost of painting the pipe@ Rs.10/m^2
=Rs(10×46.2)
=Rs462
Height of pipe=21cm
Diameter of the Pipe=70cm=0.7
We know that,
Curved surface area of cylinder=(pi×d×h) or (2×pi×r×h) sq. unit
C.S.A=(22÷7×0.7×21)m^2
=46.2m^2
cost of painting the pipe@ Rs.10/m^2
=Rs(10×46.2)
=Rs462
Answered by
2
Outer diameter = 70 cm
Outer radius= 35 cm
Height= 21 m
= 210 cm
So, Curved surface area= 2πrh
= 2x 22/7 x 35 x 210
= 46200 sq. cm
Cost for 1 sq m( 10000 sq cm) = ₹10
Cost for 46200 sq.cm = ₹4,62,000
Outer radius= 35 cm
Height= 21 m
= 210 cm
So, Curved surface area= 2πrh
= 2x 22/7 x 35 x 210
= 46200 sq. cm
Cost for 1 sq m( 10000 sq cm) = ₹10
Cost for 46200 sq.cm = ₹4,62,000
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