Similarity & Congruence Practice Test

Two triangles are shown with markings indicating equal parts. In $\triangle ABC$ and $\triangle DEF$, $\angle A$ is marked congruent to $\angle D$ (one arc), and $\angle B$ is marked congruent to $\angle E$ (two arcs). The side between those angles, $AB$, has one tick mark, and the corresponding side $DE$ also has one tick mark.

Which congruence criterion applies (SSS, SAS, ASA, AAS)?

Two triangles are shown. In $\triangle ABC$, $AB=6$, $AC=9$, $BC=12$. In $\triangle DEF$, $DE=4$, $DF=6$, $EF=8$. What is the scale factor from $\triangle ABC$ to $\triangle DEF$ (i.e., multiply lengths in $\triangle ABC$ by what number to get corresponding lengths in $\triangle DEF$)?