## Elementary Geometry for College Students (6th Edition)

By SAS, $\triangle CAB \cong \triangle DAB$
Side: It is given in the question that $\overline{AC} \cong \overline{AD}$ Angle: It is given in the question that $\angle CAB \cong \angle DAB$ Side: Both triangles share the side $\overline{AB}$, so by identity, $\overline{AB} \cong \overline{AB}$ Therefore, by SAS, $\triangle CAB \cong \triangle DAB$