# How do you find co terminal angles (find one positive, and one negative)?

## $330 \mathrm{de} g r e e s$

If you are measuring the angles in degrees, you can add and subtract multiples of ${360}^{o}$. If you are measuring in radians, add or subtract multiples of $2 \pi$.
For example, coterminal to ${30}^{o}$ would be ${390}^{o}$ or $- {330}^{o}$.
Coterminal to $\frac{\pi}{3}$ would be $\frac{\pi}{3} + \frac{6 \pi}{3} = \frac{7 \pi}{3}$ or $\frac{\pi}{3} - \frac{6 \pi}{3} = \frac{- 5 \pi}{3}$.