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Coterminal Angles

How to find the coterminal angle

Two angles a are coterminal if their sum is a multiple of 360°. What that means is that two angles are coterminal when they start and end in the same place. Examples of Coterminal angles are
  • 180° and − 180°
  • 170° and − 190°
  • 100° and − 260°
  • 360° and 720 °
  • 360° and − 360°