# Math Help - Finding Theta?

1. ## Finding Theta?

If the inital side of is along the positive x-axis and the terminal side includes the point P given below, find in radians:

(a) , =?
(b) , ?
(c) , ?
(d) , ?
(e) , ?
(f) , ?

2. When calculating the value of theta, you begin with the positive x-axis and move counterclockwise. If you know a little bit of trigonometry, these are all straightforward. Recall that $cos \frac{\pi}{4} = sin \frac{\pi}{4} = \frac{\sqrt{2}}{2}$, and the identities $cos x = - cos (\pi - x), sin x = sin(\pi - x)$.

3. Most of those answers are some form of $\frac{\pi}{2} \mbox{ or } \frac{\pi}{4}$.
For example b. is $\frac{3\pi}{4}$.
You show us some work on the others.