Use the drop-down menus to complete the paragraph proof. We are given that XY is parallel to ZW. If XZ is a transversal that intercepts XY and ZW, angle and angle are alternate interior angles. Since XY is parallel to ZW, we know that these angles are . We also know that angle XVY and angle ZVW are ✔ vertical angles, and thus congruent. We can conclude that △XYV ~ △ZWV using the similarity theorem.