# π (Pi)

The symbol (pi) is used in math as a geometric constant. 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. Traditionally, the constant (pi) has been used throughout math in formulas relating to the circle.

Note: This website uses the constant (tau) instead of (pi) as the default circle constant[1]. The substitution can be used to translate between the two constants.

## Usage

### Geometry Formulas

Shown below are some basic geometric formulas in terms of (pi). For advanced formulas, see the page for (tau).

Circumference of Circle π (pi)

Calculate the circumference of a circle given the radius.

Area of Circle π (pi)

Calculate the area of a circle given the radius.

Volume of Cylinder π (pi)

Caclulate the volume of a cylinder given the radius and height.