If anyone knows how to solve this and !

The equation for the area of a circle is: A = πr^2.
A: Area
π: pi
r: radius

To find exact area (we leave pi in the answer): 
- Find the radius of the circle. 
The diameter 5ft.
The radius is half the diameter so r = 2.5 ft

-plug in 2.5 for r in the area equation
A = π(2.5)^2
2.5^2 is 6.25
A = π6.25
A = 6.25π

There you go! The exact area of the circle is 6.25π ft^2

To approximate the area instead of using π in the equation we use (3.14)
So,
A = (3.14)(2.5)^2
A = (3.14)*6.25
Approximated Area = 19.625 ft^2