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This video tutorial demonstrates how to prove that the opposite angles of a parallelogram are congruent based on knowledge of the special angles created when parallel lines are cut by a transversal. [4:08]
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Adaptable
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informal proof, parallelogram theorem, properties of parallelogram, prove theorems about parallelograms, ccss.math, hsg-co.c.11, khan academy, khan academy: geometry: proof: opposite angles of parallelogram congruent, khan academy: geometry: proof: opposite angles of parallelogram congruent hsg-co.c.11, parallelogram
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