Answer:
Let's outline a logical sequence to prove that vertical angles ∠FMJ and ∠GMH are congruent.
1. ∠FMJ and ∠GMH are vertical angles because they are formed by the intersection of lines FG←→ and HJ←→.
2. Vertical angles are always congruent.
3. Therefore, ∠FMJ and ∠GMH are congruent.
By following this logical sequence, we can prove that ∠FMJ and ∠GMH are congruent.