Home > PC3 > Chapter 2 > Lesson 2.2.1 > Problem 2-48
2-48.
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 thequarters going clockwise from .
4. Make a triangle with the-axis.
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