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What are ASA, SAS, AAS and SSS in mathematics?
The second textbook of the first day of junior high school has the condition of triangle congruence.

A is the angle and s is the edge.

ASA is two corners and two sides,

SAS is both sides and included angle,

AAS is the opposite side of two corners,

SSS is three-sided,

These are all conditions. If satisfied, two triangles are congruent.

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