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You probably are familiar with degrees in trig, but did you know there is another way to measure angles?
These are called Radians and unlike Degrees, do not have a unit.
Why don't radians have a unit? How are they derived? Look here for guidence
Converting Between Radians and Degrees
.\begin{align*}\pi Radians=180^\circ \end{align*}
To go from degrees to Radians multiply your degrees by \begin{align*}\frac{\pi}{180^\circ }\end{align*}
To go from Radians to degrees multiply your radians by \begin{align*}\frac{180^\circ }{\pi}\end{align*}
Tips and Tricks: Since we know that \begin{align*}\pi=180^\circ \end{align*}
Radians  Degrees 
\begin{align*}\frac{\pi}{2}\end{align*} 

\begin{align*}\frac{\pi}{3}\end{align*} 

\begin{align*}\frac{\pi}{4}\end{align*} 

\begin{align*}\frac{\pi}{6}\end{align*} 
Note: In upper level math Radians are prefered over degrees because they are unitless, so you should get used to Radians!
For extra practice, try these practice problems here.