I introduce the theorem that state the interior sum of the angles of a triangle add up to 180 degrees and show how this is true with parallel lines. The second theorem I cover explains how an exterior angle of a triangle is equal to the sum of the 2 interior remote angles.
EXAMPLES at 6:34 9:00 14:46 19:43 23:32 Find free review test, useful notes and more at http://www.mathplane.com
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