Find an angle between 0 degree and 360 degree that is coterm

Find an angle between 0 degree and 360 degree that is coterminal with -150 degree. Find an angle between theta and 2 pi that is coterminal with 5 pi/2. Give exact values for your answers.

Solution

To find coterminal angle we add or subtract 2pi or 360 dgrees
a).
360+(-150)=360-150=210 degrees

b).
5pi/2-2pi=pi/2 radians