# How do you determine the measure of an angle coterminal with the angle -3 radians?

$\theta = - 3 + 2 \pi \cdot n , n \setminus \in \mathbb{Z}$
Coterminal angles differ by integer multiples of $2 \pi$ (measured in radians). All angles coterminal to $- 3$ radians can be written in the form:
$\theta = - 3 + 2 \pi \cdot n , n \setminus \in \mathbb{Z}$
where $n \in \mathbb{Z}$ means "n is an element of the integers."