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 Related Terms
 Angle-Angle (AA- Similarity):  If two angles of one triangle are congruent to two corresponding angles in another triangle, then the triangles are similar.
Similar Figures: Figures that have the same shape but not necessarily the same size.
Congruent: Having the same size, shape and measure.
Congruent Angles: Angles that have exactly the same measures.
Corresponding Angles: Angles that have the same relative positions in geometric figures.
Side-Angle-Side (SAS-Similarity): If the lengths of two sides of a triangle are multiples of two corresponding sides of another triangle (i.e. they are in proportion), and the included angles are congruent, then the triangles are similar.
Side-Side-Side (SSS-Similarity): If the lengths of all three of the corresponding sides of two triangles are multiples of each other (i.e., they are proportional), then the triangles are similar.