A The volume of a cylindrical tank is 115 ft. The height of the tank is 20 ft. What is the area of the base
of the tank?
A 5.75 ft2
B 9.5 ft2
C 13.5 ft2
D 23 ft2

Answer is A 5.75ft^2

Rearrange the equation of the volume of a cylinder to make pi x r^2 the subject

This is because Pi x r^2 is the known formula for the area of a circle which is what you have to find.

This should equal the volume divided by the height (v/h)

Sub in 115 divided by 20 and this gives the area of a circle