The inner diameter of a circular well is 3.5

Asked by admin @ 11/08/2021 in Math viewed by 276 People

The inner diameter of a circular well is 3.5m. It is 10m deep. Find

i)its inner curved surface area
ii)The cost of plastering this curved surface at the rate of Rs40 per m².

Answered by admin @ 11/08/2021

(1)inner curve surface area =2πrh
where r is inner radius
h is height of well
now,
surface area=2 x 22/7 x 7/4 x 10
=110 m^2

(2) the cost of plastering in this curve surface=area of curve surface x rate
=110 x 40= 4400 Rs

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