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March 28, 2017

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Two angles of the triangle have given measures. Find the measure of the third angle

x degrees, 120 degrees minus x degrees

  • math - ,

    The angles of a triangle add up to 180°.
    x + (120-x) + third angle = 180°

    third angle = 180° - x - (120-x)
    = 180° - 120°
    = 60°

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