State the reference angle for each of the given angle measur

State the reference angle for each of the given angle measures 10. 275° 11.-120° 12. 490° Find the exact value of each given trigonometric expression (No decimals!!!) 11. sin 30° 12. cos 45 13. tan 60°

Solution

10) 275 degrees

reference angle is 85 degrees in 4th quadrant

11) -120 degrees

reference angle is 60 degrees in 3rd quadrant

12) 490 degrees

reference angle is 50 degrees in 2nd quadrant

11) sin 30

sin 30 = 1/2

12) cos 45 = sqrt 2 / 2

13) tan 60 = sqrt 3