Chapter 8-1
There are 3 different ways to find a triangle congruent with another. there are the Side-Side-Side postulate, where all sides are congruent to another triangle, and Side-Angle-Side, which is where 2 sides are conected by an angle and they are congruent to the other triangle. The other one is not used in this section.

Side Angle Side postulate: if 2 of the sides are congruent and so is the angle inbetween, then it is a congruent triangle.

Side Side Side postulate: if all the sides are congruent, then it is a congruent triangle.