Question

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
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
Hence, vertical angles are equal.
whose is right??

Answer 1

Please post the diagram.