Thread: Angles of triangle
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Old January 13th, 2009, 05:09 PM
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skeeter skeeter is offline
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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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