complete the two-column proof of the alternate interior angles converse. given $\angle4\cong\angle5$ prove $g\ \parallel\ g$ line g and line h are cut by a transversal so that an angle labeled angle 4, formed by the intersection of the transversal and line g, and an angle labeled angle 5, formed by the intersection of the transversal and line h, are congruent alternate interior angles. an angle labeled angle 1, formed by the intersection of the transversal and line g, and angle 4 are vertical angles.