Construct Congruent Angles

This example demonstrates how to construct a pair of congruent angles using classical geometric construction. It covers the definition of an angle, the properties of congruent angles, and the step‑by‑step construction logic. The construction uses the Segment command to create segment AB, the Ray command to produce rays f, g, and h, and defines points A, B, C, D, E together with objects f, g, h to copy and verify the angle. It is suitable for middle‑school geometry lessons, construction practice, and self‑study of angle congruence.