The Angle Angle Side postulate (often abbreviated as AAS) states that if two angles and the non-included side of one triangle are congruent to two angles and the non-included side of another triangle, then these two triangles are congruent.

# Glossary Term: Definitions

A list of geometrical definitions and postulates.

A line segment from a triangle vertex and perpendicular to the opposite base.

The ring-shaped region bounded by two concentric circles.

The base of a polygon is the side from which the height is measured.

Line that divides something, such as an angle, in two equal parts.

The point of intersection of the three medians of a triangle. It divides each median in parts of ratio 1 : 2.

A line segment from a triangle vertex to the opposing side.

A chord is a line segment connecting two points on a circle. Equal-length chords span equal angles in the centre.

All points in a plane that have a fixed distance (radius) from a fixed point (centre).

Part of a circle’s boundary, characterized by its radius and a certain angle.