Sketch each of the following angles in a unit circle. Then state the coordinates of the corresponding point on the unit circle.
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