# Reference Angles and Angles in the Unit Circle

## Formed between the terminal side of an angle and the closest part of the x-axis.

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## Reference Angles and Angles in the Unit Circle

Definition of reference angle shown on the unit circle
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## Reference Angles

Definition of reference angle shown on the unit circle
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## Reference Angles and Special Angles

Definition of reference angle shown on the unit circle
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## SLT 3: Extend the def of sine from a right triangle ratio to a function of an angle of rotation

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• PLIX

## Exploring Reference Angles

Reference Angles and Angles in the Unit Circle Interactive
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## Determining Trig Function Values Using Reference Angles and Reference Triangles

Uses reference angles and reference triangles to determine the values of the 6 trigonometric functions.
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## Reference Angles - Overview

by CK-12 //basic
Overview
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## Reference Angles - Example 1

by CK-12 //basic
Find the reference angle given an angle measure
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## Reference Angles - Example 2

by CK-12 //basic
Use reference angles to evaluate trigonometric functions
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• Study Guide