Jane wants to fill her circular pool to a depth of 2m. determine the volume of water she needs, to the nearest cubic meter.

I am not given r, so I will keep it as a variable and you may plug it in afterwards. The volume for this circular pool is similar to a cylinder:

2πhr^2 = V

We are given the height, h. Plug in

2π (2) r^2 = V

If you can find r, plug it in and you can solve for V