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Mathematics 73 Online
OpenStudy (anonymous):

Triangle ABC is shown below: Given: ΔABC Prove: All three angles of ΔABC add up to 180°. The flowchart with missing reason proves the measures of the interior angles of ΔABC total 180°: Which reason can be used to fill in the numbered blank space? Alternate Exterior Angles Theorem Same-Side Interior Angles Corresponding Angles Postulate Alternate Interior Angles Theorem

OpenStudy (anonymous):

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