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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°
    reference angle |
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