Seriously, you don't understand how much i'd appreciate ! you so much in

1) NEI
2) AAS
3) NEI

in order to prove triangles congruent you need to know three parts are congruent, but you can only use these in certain orders.

SAS-
side angle side
the congruent angles are surrounded by two congruent sides so, the 3 other parts must be equal; a straight line connecting the two end points must be equal and the angles would also be congruent.

ASA-
angle side angle
the congruent sides have congruent angles on both sides so the extending lines will have the same slope and meet to form the remaining parts.

SSS-
side side side
if the sides are the same the angles will also be the same

AAS-
angle angle side
two congruent angles followed by a congruent side