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3 September, 19:13

Earl and Sean provide the following proofs for vertical angles to be equal. Earl's proof: angle 1 + angle 2 = 180° (PQ is a straight line) angle 3 + angle 4 = 180° (PQ is a straight line) Therefore, angle 1 + angle 2 = angle 3 + angle 4 (Transitive Property of Equality) Hence, vertical angles are equal. Sean's proof: angle 1 + angle 4 = 180° (transversal t is a straight line) angle 2 + angle 3 = 180° (transversal t is a straight line) Therefore, angle 1 + angle 4 = angle 2 + angle 3 (Transitive Property of Equality) Hence, vertical angles are equal. Which statement is correct?

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  1. 3 September, 21:38
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    Sean's statement is correct as <1+<2=180° and <2 + <3 = 180° thus <1=<3 and hence vertically opposite angles are equal
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