Theorem 9: Opposite Sides & Opposite Angles in a Parallelogram are Equal [Video] Added to Geometry Proofs by Allyb2106
Proof: Theorem 4 Sum of Measures of Angles in a Triangle are 180 [Video] Added to Geometry Proofs by Allyb2106
Theorem 12 Proof: Line Parallel To One Side Of A Triangle [Video] Added to Geometry Proofs by Allyb2106
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