1. Daniel atkins, kerrymindiak, ginaschnecker, kelly thorn Unit 5 – Intro to Trigonometry

2. Radians!

3. To Convert… To convert degrees to radians, multiply degrees by Practice: 1) 135° = ? 2) -270° = ?

4. Answers! 1) 2)

5. To Convert… To convert radians to degrees, multiply radians by Practice: 1) 2)

6. Answers! 1) -90° 2) 810°

7. Law of Sines

8. The Law! Two angles and any side (AAS, ASA) Two sides and an angle opposite them (SSA  the ambiguous case)

9. Problems! 1) C 102.3° a b= 27.4 ft 28.7° B A c

10. Problems! 2) A 38° 15 b 63° B C a

11. Problems! 3) C 33 50 132° A B

12. Answers! 1) A= 49.0°, c= 55.75, a= 43.06 2) C= 79°, a= 9.41, b= 13.6 3) NO SOLUTION! 

13. Law of Cosines

14. The Law! Three sides (SSS) Two sides and their included angle (SAS)

15. Problems! 1) B 14 8 A C 19

16. Problems 2) C a 15 115° A B 10

17. Answers! 1) A= 22.08°, B= 116.80°, C= 41.12° 2) a= 21.26, B= 39.75°, C= 25.25°

18. Dun…dun…dun! The Unit Circle!

19. The Circle! MEMORIZE THIS!!!

20. Problems! 1) Sin 60°= ? 2) Sin 30°= ? 3) Cos 45°= ? 4) Cos 135°= ? 5) Tan 45°= ? 6) Tan 210°= ?

21. Answers! 1) 5) 1 2) 6) 3) 4)