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?