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OpenStudy (anonymous):
Triangle ABC is shown below: Given: ∆ABC Prove: All three angles of ∆ABC add up to 180°. The flowchart with missing reason proves the measures of the interior angles of ∆ABC total 180°: Which reason can be used to fill in the numbered blank space? (4 points) Select one: a. Associative Property of Addition b. Triangle Exterior Angle Theorem c. Angle Addition Postulate d. Commutative Property of Addition
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