Coterminal Angles - Trigonometry - Library Guides

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Example 1:

Find a positive and a negative angle coterminal with a $55 °$ angle.

$\begin{array}{l} 55 ° - 360 ° = - 305 ° \\ 55 ° + 360 ° = 415 ° \end{array}$

A $- 305 °$ angle and a $415 °$ angle are coterminal with a $55 °$ angle.