Video Description: Congruent Triangles (1977), International Film Bureau Inc., Bruce and Katharine Cornwell.

Demonstrates with animation the various relationships of angles and sides to congruency in triangles.

Congruence of triangles
Two triangles are congruent if their corresponding sides and angles are equal. Congruence between two triangles can be shown through the following comparisons:

• SAS (Side-Angle-Side): Two triangles are congruent if a pair of corresponding sides and the included angle are equal.

• SSS (Side-Side-Side): Two triangles are congruent if their corresponding sides are equal.

• ASA (Angle-Side-Angle): Two triangles are congruent if a pair of corresponding angles and the included side are equal.