It is a formula to find out the area of a circle

It is the formula to find the area of a circle!

Its also the answer to this joke:

Q: Why doesn't the geometry bakery have any round boxes

A: Because the Pi R Squared

Q: Why doesn't the geometry bakery have any round boxes

A: Because the Pi R Squared

Pie has a value 3.14 and r is the radius of the circle...and pie r square is the area of the circle...