## Angle-Side-Angle (ASA)

### If two triangles have corresponding angles and included sides that are congruent, then the triangles themselves are congruent.

Angle-Side-Angle (ASA) is a postulate or a rule in geometric logic that states that two triangles are congruent if they have two corresponding angles and the included side congruent. In simpler terms, the ASA rule states that if two triangles have two angles and one side that are identical, then the triangles are congruent.

The ASA postulate can be used to prove congruence between two triangles by using deductive reasoning. To use the ASA postulate to prove congruence, you must show that the two triangles have two angles that are equal, and the side included between these two angles is congruent. This means that the other parts of the two triangles must also be equal, as the angles and side alone can only determine one unique triangle.

For example, if two triangles have angles measuring 60 degrees and 80 degrees and share a side that measures 6 cm, then we can conclude that these two triangles are congruent by the ASA postulate. If we can prove that the other parts of these two triangles – the other sides and angles – are also equal, then we can use the ASA postulate to conclude that the two triangles are congruent.

Overall, the ASA postulate is one of the five ways to prove the congruence of two triangles in geometry. It is important to know and understand the ASA postulate in order to successfully solve geometric problems involving congruent triangles.

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