SOLUTION: what is the refrence angle of -13pi/4

Algebra ->  Trigonometry-basics -> SOLUTION: what is the refrence angle of -13pi/4      Log On


   

Question 751741: what is the refrence angle of -13pi/4
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
%0D%0A%28-13pi%29%2F4%0D%0A

is a multiple is pi%2F4
so its reference angle is pi%2F4



:)