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AA Similarity Postulate

If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.

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SSS Similarity Theorem

If the corresponding side lengths of two triangles are proportional, then the triangles are similar.

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SAS Similarity Theorem

If the lengths of two sides of one triangle are proportional to the lengths of the two corresponding sides of another triangle and the included angles are congruent, then the triangles are similar.

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AA Similarity Postulate

If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.

A

B

C

E

D

F

If

​

Then

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A

B

C

E

D

F

If

​

Then

SSS Similarity Theorem

If the corresponding side lengths of two triangles are proportional, then the triangles are similar.

4 of 4

A

B

C

E

D

F

If

​

Then

SAS Similarity Theorem

If the lengths of two sides of one triangle are proportional to the lengths of the two corresponding sides of another triangle and the included angles are congruent, then the triangles are similar.