Question 1138369: If theta is a third quadrant angle and cos theta= -2/3 , find sin theta. Found 2 solutions by Boreal, ikleyn:Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! cosine is adjacent over hypotenuse or 2/3
sine is sqrt (5) so that sqrt(5)^2+2^2=3^2
third quadrant, so sine is negative
sin theta= -sqrt (5)/3 ANSWER
