Math 10 Lesson 11 5.4 (2) Trig Ratios cont.

Review Yesterday, you created a table of values for 10, 20, etc. An easier way is to look at the table in the back of your textbook there is a complete table of all angles. You will be given this during tests and quizzes.

Example 1 60° Missing Side Length: 50 m 1) Determine ratio to use tan θ = opp adj 2) Fill in what you know Tan 60° = 50 x X 3) Use table to determine tan 60° 1.7321 = 50 X 4) Cross multiply and divide 1.7321 x = 50 1.7321 x = 50 1.7321 1.7321 X = 28.9 m 60°

Example 2 Missing Angle 1) Determine ratio sin θ = opp 5 cm hyp 2) Fill in what you know sin x = 4 5 4 cm 3) Divide side lengths sin x = 0.80 4) Use table to determine sin x = 0.80 x = 53°

Let’s Try together… You Try…. Do questions 12, 13a (i), 14ab” Do Activity sheet: “What Do They Call the Big Grass Field on an Orbiting Satellite?