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

Proof 1: $\overline{AB}$ is congruent to $\overline{CD}$ and $\overline{AD}$ is congruent to $\overline{CB}$ because it is given in question. Proof 2: $\overline{AC}$ is identity Proof 3: $\triangle$ABC ≡ $\triangle$CDA is given in question
Given: $\overline{AB}$ is congruent to $\overline{CD}$ $\overline{AD}$ is congruent to $\overline{CB}$ To prove: $\triangle$ABC ≡ $\triangle$CDA