Congruent triangles: SSS, SAS, ASA and HL

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Learn it Two triangles are congruent (same shape and size) if they match by SSS (three sides), SAS (two sides and the angle between them), ASA or AAS (two angles and a side), or HL (hypotenuse and a leg of right triangles). SSA and AAA are NOT enough.

Example: AB = DE, ∠B = ∠E and BC = EF.

Two sides and the angle between them.
Congruent by SAS.

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