Question

check all that apply:
pi/6 is the reference angle for:

a) 5pi/6
b) 3pi/6
c) 13pi/6
d) 8pi/6

Answer 1

If the fraction is reduced as far as it can go and it's still a π/6 angle, then its reference angle is also π/6.
D is really 4π/3
B is really π/2
A and C are both correct answers.