Final answer:
Yes, the triangles ADFE and AHFG are similar by SAS similarity.
Step-by-step explanation:
To determine whether each pair of triangles is similar, we need to compare their corresponding sides and angles. In option a, the triangles ADFE and AHFG are similar by SAS (Side-Angle-Side) similarity because their corresponding sides AD and AH are proportional, and their corresponding angles D and H are congruent. Therefore, the answer is Yes.