<h2>AA / AAA (same thing) similarity </h2>
At least of the angles of the triangles are congruent. It can be considered as AAA similarity because if two angles are congruent, the last angle is automatically congruent.
<h2>SSS similarity</h2>
The proportions of the corresponding sides of the triangles are congruent. It has to be all three sides.
<h2>SAS similarity</h2>
The proportions of two corresponding sides of the triangles are congruent, and the angle between the two sides are congruent.
<h2>SSA similarity (uncommon case)</h2>
ONLY FOR RIGHT TRIANGLES
