SOLUTION: how to find the exact value of sin 225

Algebra ->  Trigonometry-basics -> SOLUTION: how to find the exact value of sin 225      Log On


   

Question 236338: how to find the exact value of sin 225
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
how to find the exact value of sin 225
.
Looking at the unit circle
sin(225)
is in the third quadrant
225 - 180 = 45
sin(45) mapped to the third quadrant is
-sqrt%282%29%2F2