Linear Pair of Angles

This GeoGebra example illustrates the concept of a linear pair of angles—when two adjacent angles share a common line and form a straight line. Using the commands Line, Point, Ray, Angle and objects A, B, a, C, D, b, α, β, T1, T2, T3, text1, learners can interactively build and explore this geometric relationship. The core mathematics involves angle measurement, supplementary angle relationships, and the properties of a straight line. The activity is intended for primary and secondary school students, supporting lessons on the definition of linear pairs, verification of the linear pair theorem, and hands‑on geometric construction practice.