Question

What triangle congruency criteria could be used to prove ABC is similar to DEF

Answer 1

For this 2 triangles we have one pair of congruent angles and two pairs of congruent sides that form the congruent angle.

This conditions correspond to the SAS postulate: "If two sides and the included angle of a triangle are congruent to two sides and the included angle of another triangle, then the two triangles are congruent".

Answer: SAS.