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Geometry 21 Online
OpenStudy (anonymous):

I really need help with some questions. They are on Proofs of Angles, Midsegments, and Medians. I can give medals!

OpenStudy (anonymous):

Triangle ABC is shown below. Given: ∆ABC Prove: All three angles of ∆ABC add up to 180°. The flow chart 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? Definition of Supplementary Angles Substitution Definition of Complementary Angles Angle Addition Postulate

OpenStudy (anonymous):

OpenStudy (anonymous):

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