Suppose you are given t s in the diagram below You are asked to prove that 1 is congruent to 3 Which reason for statement 2 best completes the two column proof below Statements 1 t s and line r is a transversal crossing s and t 2 1 is congruent to 2 3 2 is congruent to 3 4 1 is congruent to 3 O Corresponding angles postulate O Alternate interior angles theorem O Given information Substitution property of equality 1 Given Reasons 2 3 Vertical angles theorem 4 Transitive property of congruence