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1:39
YouTube
North Carolina School of Science and Mathematics
Sum of Interior Angles of a Triangle
A demonstration showing that the sum of the interior angles of a triangle is 180 degrees. Go here for guiding questions, notes for teachers, and example problems that you can try: https://ncssm.instructure.com/courses/789/pages/7-dot-8-completing-the-square-and-the-quadratic-formula Find more resources here: http://bit.ly/math1resources NCSSM ...
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