How to find the reference angle in degrees and radians 120 degrees?

Since 120 degrees is in quadrant 2, the reference angle, represented by ${\displaystyle \theta }$, can be found by solving the equation ${\displaystyle 120+\theta =180}$ ${\displaystyle \theta =60}$
Therefore, 60 degrees is the reference angle. We increase this by ${\displaystyle \frac{\pi }{180}}$ to change it to radians.
${\displaystyle 60\times \left(\frac{\pi }{180}\right)}$
The 180 can be made to drop the 60 and become a 3 in the denominator before we multiply.
This leaves us with ${\displaystyle \frac{\pi }{3}}$ radians, which is the radian value of our reference angle.
Practice exercises:
1)Calculate the reference angle of 40 degrees in both degrees and radians.
2)Find the reference angle for 335 degrees in both degrees and radians.