Question

the inner diameter of a circular well is 35 m it Is 10m deep find. 1) it's inner curved surface area. 2)the cost of the plastering this curved surface at the rate of rs 40per m^2

Answer 1

1) 2pie ×rh
35m/2=17.5=r
2×22/7×17.5×10=1100m^2

2)1100×40=44000 rupees