Question

the inner diameter of a circular well is 3.5 metre the depth of the well is 15M find the cost of plastering minor curved surface at the rate of rupees 25 per metre square

Answer 1

Radius = 3.5/2 = 1.75m
Depth/Height = 15m
Curved surface area of well = 2 pie rh =2×22/7×175/100×15 = 165m^2
Cost of plastering 1 m^2 = Rs.25
Cost of plastering
165m^2 = 25×165 = Rs.4125