Sketch each of the following angles onto a unit circle then find the coordinates of the angle.
The reference angle is
. What are the cosine and sine of ? When writing your final answer, remember that this angle is in the fourth quadrant.
1. Draw a unit circle.
2. Divide the top and bottom halves into quarters.
3. Put a mark on the unit circle at the
quarters going clockwise from ( ).
4. Make a triangle with the
5. Label the lengths of the sides.
6. Check for the correct signs.
7. The coordinates are (
What are the side lengths? Use the Pythogorean Theorem.
is the same angle as