Step-by-step explanation
The appropiate reasoning is the following in each case:
a) Yes. Both, the hypotenuse and the legs are congruent.
b) No. One pair of legs is congruent, but we can not affirm that the hypotenuses are congruent.
c) Yes, by the SAS and the HL Theorem, we can conclude that both triangles are congruent.
d) Yes, by the reflexive property and the given congruency between legs, we can apply the HL Theorem.