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Designed by:. Emily Freeman McEachern High School 2400 New Macland Rd Powder Springs, GA  30127. Session 17. Warm – up : Find the missing measures. Write all answers in radical form. 30 °. 45 °. x. 7. 10. z. 45 °. w. 60 °. y. 13.4 & 13.5.

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  1. Designed by: • Emily FreemanMcEachern High School2400 New Macland RdPowder Springs, GA  30127

  2. Session 17 Warm – up: Find the missing measures. Write all answers in radical form. 30° 45° x 7 10 z 45° w 60° y

  3. 13.4 & 13.5 The Trigonometric Functions we will be looking at SINE COSINE TANGENT

  4. The Trigonometric Functions SINE COSINE TANGENT

  5. SINE Prounounced “sign”

  6. COSINE Prounounced “co-sign”

  7. TANGENT Prounounced “tan-gent”

  8. Greek Letter q Prounounced “theta” Represents an unknown angle

  9. hypotenuse hypotenuse opposite opposite adjacent adjacent

  10. We need a way to remember all of these ratios…

  11. Some Old Hippie Came A Hoppin’ Through Our Old Hippie Apartment

  12. Sin SOHCAHTOA Opp Hyp Cos Adj Hyp Tan Opp Adj Old Hippie

  13. Finding sin, cos, and tan

  14. SOHCAHTOA 10 8 6

  15. Find the sine, the cosine, and the tangent of angle A. Give a fraction and decimal answer (round to 4 places). 10.8 9 A 6

  16. Find the values of the three trigonometric functions of . ? Pythagorean Theorem: 5 4 (3)² + (4)² = c² 5 = c 3

  17. Find the sine, the cosine, and the tangent of angle A Give a fraction and decimal answer (round to 4 decimal places). B 24.5 8.2 A 23.1

  18. Practice Workbook Page 77 # 1-4 Page 78 # 1-4

  19. Finding a side

  20. Ex. A surveyor is standing 50 feet from the base of a large tree. The surveyor measures the angle of elevation to the top of the tree as 71.5°. How tall is the tree? tan 71.5° ? tan 71.5° 71.5° y = 50 (tan 71.5°) 50 y = 50 (2.98868)

  21. Ex. 5 A person is 200 yards from a river. Rather than walk directly to the river, the person walks along a straight path to the river’s edge at a 60° angle. How far must the person walk to reach the river’s edge? cos 60° x (cos 60°) = 200 200 60° x x X = 400 yards

  22. Practice Workbook Page 77 # 7 & 8 Page 78 # 5 & 6

  23. Classwork: Worksheet SPW 147 & 149 due at the end of class.

  24. HOMEWORK: P. 568 # 8-12, 14, 17, 18 P. 576 # 12-15, 20-21, 22-32 even Quiz next class

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