How do I find the area of a circle with the circumference of 18.84 units

A circle with radius r has a circumference of 2πr.
2πr = 18.84 ==> r = 18.84/(2π) ≈ 2.998 units
The same circle has area πr ² sq. units. So the area is
π (2.998)² ≈ 28.246 sq. units