The 3 triangle similarity criteria are:

AA (Angle-Angle: Two corresponding angles are congruent)

SAS (Side-Angle-Side: Two corresponding side lengths are proportional and their included angles are congruent)

SSS (Side-Side-Side: Three corresponding side lengths are proportional)

AA (Angle-Angle: Two corresponding angles are congruent)

SAS (Side-Angle-Side: Two corresponding side lengths are proportional and their included angles are congruent)

SSS (Side-Side-Side: Three corresponding side lengths are proportional)