Question

the rain Falls 10 cm on a particular day the rain water that falls on a roof 70 M long and 44 metre wide was collected in a cylindrical tank of radius 14 M find volume of water that fall on the roof and. Rise of water level in the tank due to rain water

Answer 1

height of water = H = 10cm = 0.1m 
length = L = 70m 
width = W = 44m 

V(roof) = LWH = 70*44*0.1 = 308 m^3 

(ii) 
r = 14m 
h = increase in height of water in tank 
The tank is cylindrical so 
V(tank) = πr²h = 196πh 

The increase in volume in the tank is equal 
to the volume of water that falls on the roof 
V(tank) = V(roof) 
196πh = 308 
h = 308/(196π) = 11/(7π) ≈ 0.50 m = 50cm