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Math Help - Angles of triangle

  1. #1
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    Angles of triangle

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  2. #2
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    you should be very familiar with the first equation ...

    m\angle{1} + m\angle{2} + m\angle{3} = 180^{\circ}

    since m\angle{3} + m\angle{4} = 180^{\circ} ( a linear pair)

    m\angle{1} + m\angle{2} + m\angle{3} = m\angle{3} + m\angle{4}

    so ...

    m\angle{1} + m\angle{2} = m\angle{4}
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