| Question | Answer |
| "SSS" or Side-Side-Side Congruency | If all sides of one triangle are congruent to the corresponding sides on another triangle, then the two triangles are congruent |
| "SAS" or Side-Angle-Side Congruency | If two side lengths and the angle between them are congruent to the corresponding sides and angle on another triangle, then the two triangles are congruent |
| "ASA" or Angle-Side-Angle Congruency | If two angles and the side between them are congruent to the corresponding angles and side on another triangle, then the two triangles are congruent |
| "AAS" or Angle-Angle-Side Congruency | If two angles and the side length next to one of them (not between) are congruent to the corresponding angles and sides on another triangle, then the triangles are congruent. |
| H | Longest side of a triangle |
| Legs | The two shorter sides of a triangle |
| Hypotenuse-Leg Theorem | If the hypotenuse and one leg of a triangle are congruent to the hypotenuse and corresponding leg of another triangle, the two triangles are congruent. |
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