### 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