## anonymous one year ago Please Help! When Θ = 5 pi over 6, what are the reference angle and the sign values for sine, cosine, and tangent?

1. Nnesha

|dw:1433434227050:dw| these are the reference angles

2. Nnesha

do you know where is 5pi/6 at in unit circle ?

3. anonymous

Thank you! Here are the multiple choice options by the way

4. anonymous

And I think it's in the second quadrant, right?

5. Nnesha

yes that's right i like degrees if you like it too then you can convert radians to degrees $\huge\rm \frac{ 5\pi }{ 6 } \times \frac{ 180 }{ \pi }$

6. Nnesha

and if you look at the unit circle 5pi/6 is here|dw:1433434723738:dw| and you need signs of cos sin and tan values for that just remember CAST rule or it is like normal x y graph

7. Nnesha

$$\huge\color{Green}{{\rm CAST}}$$ rule is |dw:1433434776048:dw|

8. anonymous

So that would mean that only sin is positive, and the rest are negative

9. Nnesha

yes that's right!

10. Nnesha

wait

11. anonymous

Thank you so much!! And hm?

12. Nnesha

nvm :-)

13. anonymous

Thanks again :)