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```Chapter 13: Trigonometry
Algebra 2
Name
Block
Date
Trigonometry is a Greek term meaning
Triangles consist of two components


Note: rather than using x as our unknown when dealing with angles
is often used.
Ratios/Relations in triangles dependent on the


The ratios formed by the sides have names/labels:
sin  =
Remember
cos  =
tan  =
Example: Write 3 basic trigonometric ratios for the following triangle.
5
3

4
sin 
=
cos 
=
tan 
=
Looking Back at the 30, 60, 90
sin
cos
tan
sin
cos
tan
30o
60o
Looking Back at the 45, 45, 90
45
Solving for missing sides.
Steps:
1. Label your sides bases on the angle given (opp, adj, hyp)
2. Pick one side to solve for first
3. Pick the correct trig function using SOHCAHTOA
a. Using given side and the side you are trying to find
5. Solve (get the variable by itself)
Find the missing sides of these right triangles using trigonometry.
1.
2.
y
10
60
y
x
3.
6 2
x
19
x
45
13
y
```