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Triangle Similarity Toolkit Angle-Angle Similarity Theorem (AA~) AA~ If two triangles have two pairs of corresponding angles that have the same measure, then the triangles are similar. A D and B E therefore ABC DEF Side-Angle-Side Similarity Theorem (SAS~) SAS~ If two triangles have two pairs of corresponding sides that are proportional and the angles between them have the same measure, then the triangles are similar. 8.4 12.2 2 , U A , and 2 therefore RUN 4.2 6.1 CAT Side-Side-Side Similarity Theorem (SSS~) SSS~ If two triangles have all three pairs of corresponding sides that are proportional (this means that the ratios of corresponding sides are equal), then the triangles are similar. 12 9 6 1.5 , 1.5 , and 1.5 therefore ABC DEF 8 6 4 Similar triangles have the same angle measurements and all of their sides have the same proportional ratio. If the corresponding sides have a ratio of 1, then the triangles are congruent.