Triangle Congruence by HL (Side–Angle–Side)

This example demonstrates triangle congruence using the HL criterion (two sides and the included angle). It helps learners verify that two triangles are congruent by comparing corresponding sides and the included angle between them, showing that the remaining parts (other angles and the third side) must match as well. Key concepts include triangle congruence, corresponding vertices, included angles, and the logical structure of the HL proof method. No GeoGebra command summary is provided; the construction is typically carried out by creating two triangles, specifying the two given sides and the included angle for each, then marking corresponding edges and angle measures to visually/mentally confirm the HL condition and the resulting congruence. Suitable for middle school geometry lessons, geometry reasoning practice, and interactive learning with GeoGebra.