In this lesson, you will learn how to find coterminal angles using the unit circle. Coterminal angles are two angles that share the same initial and terminal side. You can find these angles visually by graphing them on the unit circle or algebraically by adding or subtracting 360 degrees or 2 pi for radians. When dealing with radians, it's important to know the values of pi/2, pi, 3pi/2, and 2pi on the unit circle.
Finding coterminal angles using the unit circle
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Questions answered by this video:
What are coterminal angles?
What is the initial side of an angle?
What is the terminal side of an angle?
Given an angle in degrees, how can I find a coterminal angle?
Given an angle in radians, how can I find a coterminal angle?
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This video shows how to find coterminal angles using both radians and degrees. The instructor uses graphs to demonstrate the concept