To get the area of the circle, you must use the formula to get the area:
A=πr².
The variable r is the radius, which is 1.8 meters on this circle.
So, first you have to get the square root of r (or 1.8).
r²=3.24
Now, multiply with pi (π).
3.24π≈10.178
So, the area is about 10.18 m².