Question

refernce angle for pi/3 ?

Answer 1

pi/3 is already in the first quadrant so it's reference angle is itself...
a reference angle is an angle between 0 and pi/2

Answer 2

okay, but it has choices like 2pi/3 and 15pi/3 and 19pi/3 and 7pi/3 ?

Answer 3

that can't be because a reference angle is between 0 and pi/2...

Answer 4

or are those choices one of the angle that has pi/3 as a reference angle...

Answer 5

yes

Answer 6

boy... that was a long time to answer the question huh?

Answer 7

the answer would be 7pi/3 because
7pi/3 = 6pi/3 + pi/3

6pi/3 = 2pi which is just a full rotation. what's left is pi/3, your reference angle... :)

Answer 8

ohh thank you :D