Question

Which of the follow is pi/3 the reference angle for? (Can choose more than one) (Will give medal & fan)

(posting options in comments)

Answer 1

\[\frac{ 2\pi }{ 3 }\]\[\frac{ 15\pi }{ 3 }\]\[\frac{ 7\pi }{ 3 }\]\[\frac{ 19\pi }{ 3 }\]And if whoever answers this could explain why the answer(s) is/are what it/they is/are, that'd be cool.

Answer 2

@phi ?

Answer 3

Any angle outside of the range 0 to pi/2 (0 to 90º) can be reduced to the reference angle.
I would try to plot each angle to see where it is

For example the first angle 2pi/3