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Lesson 8.4

Lesson 8.4. Trigonometry. Trigonometry. Definition: “measure of a triangle” Trig ratio: ratio of the lengths of the sides of a right triangle (sine, cosine, tangent). http://www.youtube.com/watch?v=4iC-gjKvc7A. Soh Cah Toa. Sin C =. Cos C =. Cos A =. Tan A =. Sin A =. Tan C =.

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Lesson 8.4

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  1. Lesson 8.4 Trigonometry

  2. Trigonometry Definition: “measure of a triangle” Trig ratio: ratio of the lengths of the sides of a right triangle (sine, cosine, tangent). http://www.youtube.com/watch?v=4iC-gjKvc7A

  3. SohCah Toa Sin C = Cos C = Cos A = Tan A = Sin A = Tan C =

  4. Table of Trig Ratios • Use to find sin, cos, and tan values at a certain angle measure. Example 1: Find Cos 42 Example 2: Solve for x….Tan x = .7562

  5. Find the measure of a side using trig

  6. Find the measure of a angle using trig

  7. Marker boards!

  8. Trig Tables! • Sin 67 • Cos 86 • Tan 2 • Cos 34 • Tan 45 • Sin 50 • Sin x = .0913 • Cos x = .7936 • Tan x = .3457 • Cos x = .7071 • Sin x = .0652 • Tan x = 5.6402

  9. Find each value

  10. Find the measure of a side using trig

  11. Find the measure of a angle using trig

  12. Assignment • Workbook p. 103

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