Geometry - Ch. 3: Proofs (16 of 17) Geometry Proof #8: Supplementary Angles

In this video I will proof the geometry proof #8: (angle)1 and (angle)2 are supplementary, (angle)3 and (angle)4 are supplementary, and m(angle)1= m(angle)3 then m(angle)2= m(angle)4.

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