Math, asked by jumanaarif86, 1 year ago

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 rs 10 per sq m.

Answers

Answered by khushbuuu
4
outer radius = 0.35m 
h = 21 m
csa = 2 x 22/7 x 0.35 x 21
       = 46.15 m2
cost = 46.15 x 10
        = Rs 461.5

Answered by dheeraj68
6
diameter = 70cm =>radius = 70/2 =35cm
height = 21m= 2100cm
therefore curved surface area of the cylinder
=> 2*22/7*35*2100
=>462000cm2
=>46.2m2
rate of painting = rs.10
cost of painting = 46.2*10=>rs.462

dheeraj68: thank u
jumanaarif86: Thank u
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