Question

How do you find the reference angle associated with the rotation of theta= 5pi/4?

Answer 1

5pi/4 is in quadrant III so the reference angle is the equivalent of what it would be in the first quadrant

if you had 7pi/4, the reference would be pi/4
if you had 3pi/4, the reference would be pi/4
if you had -pi/6, the reference angle would be pi/6
and so on