This is a set of 16 flash cards designed for independent or partner use. Each flash card shows a diagram of two triangles, and on the back of the card is the congruence theorem that would be used to prove the triangles are congruent. There are some that are labeled "not possible."
The answer keys are included!
I also have algebraic, segment, angle, SSS, SAS, ASA, AAS, isosceles, and equilateral proofs in my store. This set is also included in my growing Geometry Proof Bundle that is in my store!