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How to find coterminal angles using drawings

1,001 views · Published 17 December 2010 · 3:43 · Indexed 11 October 2026

Channel: Brian McLogan · 2010 · Education

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👉 Learn how to determine co-terminal angles given one angle. An angle is a figure formed by two rays that have a common endpoint. The two rays are called the sides of the angle while the common endpoint is called the vertex of the angle. We measure angles starting from the positive x-axis, i.e. the initial side of an angle measure is usually the positive x-axis. The angle measured in the anti-clockwise direction is called a positive angle while a negative angle is measured in the clockwise direction. 

Coterminal angles are angles that have the same initial and terminal sides. Coterminal angles are found by adding/subtracting 360 degrees (for degree angle measure) or 2pi (for radian angle measure) to/from the given angle.  Usually, we are looking for the smallest positive and smallest negative coterminal angles since there are infinitely many answers.

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Organized Videos:
✅ Angles in Trigonometry
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMrdn9zTKTFo5MayxpoQkKWB
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✅ Convert Degrees to Degree Minute Seconds
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✅ Convert Degree Minute Seconds to Degrees
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMrZmQzUM7FeVAsKtYOqM8VT
✅ Coterminal Angles | Learn About
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMoqhYuu6l44dkl97jg3V62_
✅ Find Coterminal Angles | 0 and 2pi
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMrJJVmzS9g-s6nDoIXrIR2l
✅ Find Coterminal Angles | 0 and 360
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMoA7QwPW6Wd78ePabiyQwOZ

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