Question

What does pi r 2 mean

Answer 1

Pi r² is circle's area expression.
So the r is radius,.

Answer 2

In this expression, pi r^2, pi is 3.14 in approximation, considering with r, r means radius, and 2 is the exponent for r (they called this r squared), so pi r^2 is the formula for the area of a circle.

Hope this helped!

Nate