This document defines the trigonometric functions of sine, cosine, and tangent by relating the ratios of opposite, adjacent, and hypotenuse sides of a right triangle to the angle θ. It then provides examples of using these definitions to calculate the sine, cosine, and tangent of an angle where the lengths of the sides of a right triangle are given. The document directs the reader to additional trigonometry resources for more information.

1. sin θ = opposite
hypotenuse

2. cos θ = adjacent
hypotenuse

3. tan θ = opposite
adjacent

4. opposite
sin θ =
hypotenuse
5
= 13

5. adjacent
cos θ =
hypotenuse
12
= 13

6. opposite
tan θ =
adjacent
5
= 12

8. For more information about trigonometry click on
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