Question

Whats the reference angle for 11π/6? explain why

Answer 1

X = 11π / 6 = 330 °
To find the reference angle for angle in Quadrant IV the formula is:
α = 360° - x
α = 360° - 330° = 30°
Answer:
The reference angle is 30° or π/6. 

Answer 2

The reference angle of something is its angle measure in the first quadrant.
angle is in  the fourth quadrant 
 2 pi - 3pi/6 
3pi/2 radians and that is your reference angle.
hope this helps