Answer: #2. Small triangle-JK, KM, JM. Medium triangle-MK, KL, ML.
#3. Medium triangle-b, d, c. Original triangle-f, d, e.
Step-by-step explanation: For #2 the to letters put together are one side length. For example when you connect J and K it makes one side. So for the small triangle when you connect points JK, KM, and JM they create the small triangle. For the medium triangle when you connect points MK, KL, and ML they create the medium triangle. For #3 each letter is one side, and when you connect them they make a triangle. So for the medium triangle when you connect b, d, and c it creates the medium triangle. For the original triangle when you connect f, d, and e it creates the original triangle. I hope that this helped you a little.