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Definitions of Trig Ratios Lesson MA20SPH September 26 2014
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3.1 Definitions of Trig Ratios.notebook
1
September 26, 2014
Unit 3. TrigonometryREVIEW: What do you know about trig?
3.1 Definitions of Trig Ratios.notebook
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September 26, 2014
Definitions of a Right Triangle
3.1 Definitions of Trig Ratios.notebook
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September 26, 2014
3.1 Definitions of Trig Ratios.notebook
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September 26, 2014
Trigonometric Ratios
A ratio compares values
3.1 Definitions of Trig Ratios.notebook
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September 26, 2014
These are similar triangles. Therefore we know...
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Definition of Trig Ratios
Name Ratio Notation
3.1 Definitions of Trig Ratios.notebook
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3.1 Definitions of Trig Ratios.notebook
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September 26, 2014
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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September 26, 2014
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)