Definition of congruent triangles (CPCTC) - two triangles are congruent if and only if their corresponding parts are congruent

__Properties:__ congruence
of triangles is reflexive, symmetric, and transitive

__SSS Congruency__
- If the sides of one triangle are congruent to the sides of a
second triangle, then the triangles are congruent

__SAS Congruency__
- If two sides and the included angle of one triangle are congruent
to two sides and the included angle of annother triangle, then
the triangles arre congruent

__ASA Congruency__
- if two angle sand the included side of one triangle are congruent
to two angles and the included side of another triangle, then
the triangles are congruent

__AAS Congruency__
- If two angles and a non-included side of one triangle are congruent
to the corresponding two angles and side of a second triangle,
then the triangles are congruent

__Isosceles Triangle Theorem__ - If two *sides* of a triangle are congruent,
then the angles opposite those sides are congruent. If two *angles*
of a triangle are congruent, then the sides opposite those angles
are congruent.

*Explorations with GSP

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