Two triangles are congruent when they have the same shape and size. That means their corresponding sides are of equal length and their corresponding angles are of equal measure.

Two triangles are similar when they have the same shape. That means their corresponding angles are equal and that the length of corresponding sides are scaled by a common scale factor.

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Definition

SSS Congruence Rule

AAS Congruence Rule

ASA Congruence Rule

SAS Congruence Rule

HL Congruence Rule

Congruent Triangles

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