Answer:
1) FK
2) SQR
Explanation:
In congruence statements such as these, each letter's position corresponds to the letter in the same position on the other side.
For example, in 1, MK corresponds to FK because M and F are in the same position and K is in the same position as itself (reflexive property).
In 2, FHG corresponds to SQR because each letter is in the same position in the given congruence statement.