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jakob
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if two lines intersect, then the vertical angles are congruent. How do you prove that?
 one year ago
 one year ago
jakob Group Title
if two lines intersect, then the vertical angles are congruent. How do you prove that?
 one year ago
 one year ago

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ilovenyc Group TitleBest ResponseYou've already chosen the best response.1
Proof: Let line AB intersect line CD at point O. Angle AOC + Angle COB = 180, because AB is a straight line and therefore equal to 180. By the same reasoning, Angle COB + Angle BOD = 180. Since both sums are equal to 180, then Angle AOC + Angle COB = Angle COB + Angle BOD. Now subtract Angle COB from both sides: Angle AOC = Angle BOD.
 one year ago
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