# Measuring Angles in Trigonometry

## In trigonometry, angles are measured in the same units as in geometry—in **degrees** and **radians**.

## However, in trigonometry the angle of rotation is not limited to the range of 0 to 180 degrees, as in geometry, and can be **positive** or **negative**. Therefore, an angle in trigonometry can be expressed in degrees by any real number within the range of minus infinity to plus infinity.

Angles in trigonometry are denoted by lowercase Greek letters: α, β, γ, etc.