how many cubic meters of the earth must be dugvout to sink a well 7m deep and radius 5m? find the cost of plastering its lateral surface area at the rate of Rs.15per msq.
Answers
Answered by
4
given
depth =h=7m
radius =r =5m
earth dug out = volume of cylinder
= pi*r^2*h
= 22/7* 5*5*7
=550 cu m
lateral surface area of the well= 2*pi*r*h
=2*22/7*5*7
=220 sq meters
cost of plastering 1 square meters=Rs 15
cost of plastering 220 square meters= 15×220
=Rs3300
depth =h=7m
radius =r =5m
earth dug out = volume of cylinder
= pi*r^2*h
= 22/7* 5*5*7
=550 cu m
lateral surface area of the well= 2*pi*r*h
=2*22/7*5*7
=220 sq meters
cost of plastering 1 square meters=Rs 15
cost of plastering 220 square meters= 15×220
=Rs3300
mysticd:
it's all right
Similar questions