This presentation is the property of its rightful owner.
1 / 9

# 9.9: Introduction to Trigonometry PowerPoint PPT Presentation

9.9: Introduction to Trigonometry. Trig ratios. The three basic trigonometric ratios are sine , cosine , and tangent . Each of these is the ratio of two specific sides of a right triangle . SOH – CAH - TOA. sin A = ____________. cos A = ____________. tan A = ____________. Example 1.

9.9: Introduction to Trigonometry

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

## 9.9: Introduction to Trigonometry

### Trig ratios

• The three basic trigonometric ratios are sine, cosine, and tangent. Each of these is the ratio of two specific sides of a right triangle.

• SOH – CAH - TOA

sin A = ____________

cos A = ____________

tan A = ____________

### Example 1

• Find each ratio

sin A =

cos A =

tan A =

sin B =

cos B =

tan B =

A

25

7

C

B

24

### Example 2

• Find each ratio

sin 30 =

cos 30 =

tan 30 =

sin 60 =

cos 60 =

tan 60 =

30∘

### Example 3

• Find each ratio

sin 45 =

cos 45 =

tan 45 =

45∘

### Example 4

• Given: ▭EXPO, EX = 8, EO = 6

• Find: sin ∠XEP

E

8

X

6

O

P

### Example 5

• If tan ∠W = √3, find m∠W

### Example 6

• Given: sin ∠S= 5/13

• Find: cos ∠S

A

10

U

S

### Homework

• p. 420 1-4, 8-13