<span>No, because postulates are assumptions. Some true, some not. So it can't be used to prove it</span>
Answer:
Reference angles are always acute.
We can find the reference angle with the "formula"
π
−
θ
, where
θ
is our given angle.
We can plug
5
π
6
into our expression to get
π
−
5
π
6
=
6
π
6
−
5
π
6
=
π
6
Thus, our reference angle is
π
6
