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Term 1: Side-Side-Side (SSS) Congruence Postulate
Definition 1: If three sides of one triangle are congruent to three sides of another triangle, then the triangles are congruent. (△ABC≅△DEF)(\triangle ABC \cong \triangle DEF) if AB=DEAB=DE, BC=EFBC=EF, and CA=FDCA=FD.
Term 2: Side-Angle-Side (SAS) Congruence Postulate
Definition 2: If two sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle, then the triangles are congruent. (△ABC≅△DEF)(\triangle ABC \cong \triangle DEF) if AB=DEAB=DE, ∠B=∠E\angle B = \angle E, and BC=EFBC=EF.
Term 3: Angle-Side-Angle (ASA) Congruence Postulate
Definition 3: If two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, then the triangles are congruent. (△ABC≅△DEF)(\triangle ABC \cong \triangle DEF) if ∠A=∠D\angle A = \angle D, AB=DEAB=DE, and ∠B=∠E\angle B = \angle E.
Term 4: Angle-Angle-Side (AAS) Congruence Theorem
Definition 4: If two angles and a non-included side of one triangle are congruent to two angles and the corresponding non-included side of another triangle, then the triangles are congruent. (△ABC≅△DEF)(\triangle ABC \cong \triangle DEF) if ∠A=∠D\angle A = \angle D, ∠B=∠E\angle B = \angle E, and BC=EFBC=EF.
Term 5: Hypotenuse-Leg (HL) Congruence Theorem
Definition 5: If the hypotenuse and a leg of a right triangle are congruent to the hypotenuse and a leg of another right triangle