Question

The dome of a building where old age people live is in the shape of a hemisphere 7cm.Eleven children decided to help the old aged people by collecting money white washing the dome If white washing costs Rs2 per Square metre.How much each child has to would pay?so find volume of air inside the dome? which value is depioted the Children.

Answer 1

now ..1st of all ..i assume what is mention as 7cm should be the radius of the hemisphere and it should be 7m since its a dome fir living people :D

now 1st part of the question asks the amount per child in order to white wash.
to do that we must know the total cost.
in order to get total cost

total cost = cost per square meter x area of the dome

area if the dome = area if a sphere / 2 = (4 pi r^2) / = 2(pi)(r^2)

now for the 2nd part..

volume of air inside dome = volume of the dome = volume of a sphere /2

volume of a sphere = (4/3) (pi)(r^3)

hope this helps :)