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

2. 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.

3. 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°
= 50 X
4) Cross multiply and divide
x = 50
x = 50
X = 28.9 m
60°

4. 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 ) Divide side lengths sin x = 0.80
4) Use table to determine sin x = 0.80
x = 53°

5. 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?