3. Unit Circle

What is the reference angle for a $240°$ angle?

Which of the following pairs of angles have the same reference angle?

Which expression can be used to determine the reference angle for an angle $\theta$ in standard position if $\theta >180°$ but $\theta <360°$?

Which equation can be used to determine the reference angle for an angle $\theta$ in standard position?

Which set of ordered pairs represents angles in standard position that share the same reference angle?

Which of the following pairs of angles have the same reference angle?

If $\theta$ is an angle in standard position such that $\theta >180°$ and $\theta <360°$, which equation can be used to determine the reference angle $r$?

Identify the reference angle of each given angle.

120°

Identify the reference angle of each given angle.

$\frac{7\pi}{4}$ rad

Identify the reference angle of each given angle.

210°

Identify what angle, $\theta$ , satisfies the following conditions.

$\sin\theta=\frac12$; $\tan\theta$ < $0$

Identify what angle, $\theta$ , satisfies the following conditions.

$\cos\theta=\frac{\sqrt3}{2}$; $\sin\theta$ < $0$