In this video, you will learn the Reflexive Property of Congruence so you can use it in a logic proof.

Reflective Property of Congruence: A quantity is congruent to itself.

In this problem, our goal is to prove $\Delta ABC \cong \Delta DCB$

Since $\overline{BC}$ is a side in both triangles, it must be equal to itself because of the Reflexive Property of Congruence.