If you use the SAS theorem, you can prove the triangles are congruent. Due to vertical angles, we have one angle, and we know one side is congruent. In order to prove these triangles are simillar, we need another side
ASA stands for "angle, side, angle" and means that we have two triangles where weknow two angles and the included side are equal. If two angles and the included side of one triangle are equal to the corresponding angles and side of another triangle, thetriangles are congruent.
