What else would need to be congruent to show that abc=def by the aas theorem?

to make δabc ≅ δdef by ssa

we need two corresponding angles and one corresponding side

so, we have given:

∠a ≅ ∠d   ,     ∠b ≅ ∠e

∵ corresponding parts of congruent triangles are congruent.

so, the corresponding side should be one of the following

ab ≅ de   ,   bc ≅ ef   ,   ac ≅ df

by comparing to the given options

so, the correct answer is option a

so far i think you have the right thing going for you just remember soh cah toh

step-by-step explanation:

sine over hypotenuse

cosine   equals adjacent

tangent over hypotenuse

step-by-step explanation:

659