Triangle Congruence Flashcards

Vocabulary flashcards on triangle congruence rules, right triangle theorems, and diagram notation.

SSS (Side-Side-Side) Congruence

A congruence theorem stating that if 3 sides in a $\triangle$ correspond to 3 sides in another $\triangle$, then the two $\triangle$'s must be congruent.

SAS (Side-Angle-Side) Congruence

A congruence theorem where two sides and the included angle in between the 2 corresponding sides are congruent.

AAS (Angle-Angle-Side)

A congruence rule requiring two corresponding and congruent angles and one set of corresponding and congruent sides.

ASA (Angle-Side-Angle)

A triangle congruence rule where two angles and the included side between them are corresponding and congruent.

HL (Hypotenuse-Leg)

A congruence rule used for right triangles only, requiring a congruent hypotenuse and leg.

SSA

A combination of Side-Side-Angle that can never ever be used to prove triangle congruence.

Tic Marks

Markings on sides or angles in a geometric diagram that mean congruence.

Congruence Statement

A statement such as $\triangle ABC \text{ } \frac{\text{?}}{\text{?}} \text{ } \triangle DEF$ or $\triangle ABC \ni \triangle DEF$ that indicates triangle congruence and must be written in corresponding order.