They are congruent because of the angles, which means the congruency reason should be SAS.
Which equation? Sorry I don’t see one
Use the identity:-
a^2 + b^2 = (a + b)^2 - 2ab
Plugging in the given values;-
a^2 + b^2 = 6^2 - 2*7 = 36-14 = 22 Answer
I pray to hod for yourgood day
