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Geometry 4.3c, Exterior Angles Theorem & Third Angles Theorem

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Mathematics

An explanation of the interior and exterior of a figure, interior angles, exterior angles, and remote interior angles. We discuss the Exterior Angle Theorem and applying it to find the measure of an angle, and the Third Angles Theorem and applying it to find the measures of missing angles. Then, we prove the Exterior Angles Theorem in a two-column proof.

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