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Side-Side-Side (SSS) Congruence Theorem
See It in Action
Two examples of the idea done right—and one common look-alike that is not right.
EXAMPLE
EXAMPLE
NON-EXAMPLE
Definition
If three sides of one triangle are congruent to three sides of another triangle, then the two triangles are congruent.
Key points:
All three corresponding sides must be congruent.
No angle information is needed—side lengths alone determine the triangle’s shape.
This is one of the strongest and most commonly used triangle congruence theorems.
Video
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