# π (Pi)

The greek letter (pi) is a geometric constant that traditionally appears in numerous formulas relating to circles and angles. The value of is naturally occuring and can be found by dividing the length of a circle’s circumference by the length of its diameter.

## Usage

Note: Traditionally, the constant (pi) is used throughout math in formulas relating to the circle. However, this website uses the constant (tau) instead of (pi) as the default circle constant for reasons discussed here. The substitution can be used to translate between the two constants.

### Geometry Formulas

Shown below are some basic geometric formulas in terms of (pi).

Area of Circle π (pi)

The traditional formula for the area of a circle is given in terms of the geometric constant π (pi).

Volume of Cylinder π (pi)

The volume of a cylinder is equal to PI multiplied by its radius squared and its height.