Understanding your post takes a bit of guesswork. I'm assuming you mean the following expression:
pi * r^2 ("pi times the square of the radius, r").
Unless you share the value of "x," we can't go any further. The intermediate answer is
pi * x^2.
If x represented the radius of a circle, and if x=3 inches, then the area of the circle would be
A = pi * (3 inches)^2, or p * 9, or 9 * pi.
Or you could approximate pi with "3.14": Area = A = 3.14 * 9. Evaluate this to 2 decimal places.