7. The inner diameter of a circular well is 4.2 m. It is 12 m deep. Fi – InterviewSolution

1.	7. The inner diameter of a circular well is 4.2 m. It is 12 m deep. Find (i) its inner curved surface area(i) the cost of plastering the inner curved surface at the rate of R 50 per m2.A metal pipe is 77 cm long, the inner diameter of the cross-section is 4 cm and the outer diameter is
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