Math, asked by aryan5866, 1 year ago

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

Answers

Answered by LekshmiRS

this may be the solution.

Attachments:

rajanshul632: i think it should be 462 rupees

LekshmiRS: when we round off 461.8 it becomes 462.

Anonymous: no mate...its wrng..plz crct it..

rajanshul632: tq....you are right i m wrong

LekshmiRS: I'm getting only this answer .I tried. the ans will contain decimals because of the use of π. I think 462 is the rounded answer.

Anonymous: yes.. ok i got..srry..^_^

LekshmiRS: yeah ok

Answered by Anonymous

Hey mate...here is ur ans..☺☺

Radius = 70/2cm = .70/2

Height = 21m

Curved surface area of cylinder
$= > 2\pi \: rh \\ \\ = > 2 \times \frac{22}{7} \times \frac{.70}{2} \times 21 \\ \\ = > 22 \times .10 \times 21 \\ \\ = > 46.2 {m}^{2}$

Rate = 10/- per m^2

Cost = 46.2 × 10

= 462/-

Hope it helps u....thanks...☺☺

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