2.1 Definitions of Trigonometric Ratios

3.1 Definitions of Trig Ratios.notebook

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September 26, 2014

Unit 3. TrigonometryREVIEW: What do you know about trig?

3.1 Definitions of Trig Ratios.notebook

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Definitions of a Right Triangle

3.1 Definitions of Trig Ratios.notebook

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3.1 Definitions of Trig Ratios.notebook

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Trigonometric Ratios

A ratio compares values

3.1 Definitions of Trig Ratios.notebook

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These are similar triangles. Therefore we know...

3.1 Definitions of Trig Ratios.notebook

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Definition of Trig Ratios

Name Ratio Notation

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3.1 Definitions of Trig Ratios.notebook

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Find...

a.) tan40º

b.) sin55º

c.) cos70º

d.) tan30º

e.) sin25º

What do these mean...?

3.1 Definitions of Trig Ratios.notebook

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Example 1. Find all the trig ratios of ∠A (tan∠A, sin∠A, cos∠A)

A

B

C3

45

3.1 Definitions of Trig Ratios.notebook

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September 26, 2014

You try! Find all the trig ratios of ∠Z (tan∠Z,

sin∠Z, cos∠Z)