1. Unit Circle

2. Unit Circle
Circle whose radius is 1 unit 1 y x

3. Trig Ratios
Reciprocals!

4. Special Right Triangle: 30-60-90
60°
Find the missing parts. 2x x
60°
30° 40
60° 44
30°
30°
Check using Pythagorean Theorem:

5. Trig Ratios for
60° 2x x
30°

6. Special Right Triangle: 45-45-90
45°
Now check using Pythagorean Theorem: x 2
45° x

7. Trig ratios for
45° x
45° x

8. Special Right Triangles Recap
Now, let’s put
these on the
unit circle!

9. NOTE:
(cos, sin)

10. Use the unit circle to find the following:

11. Use the unit circle to find the following:

12. Use the unit circle to find the following:

13. Homework
Worksheet