Constructing a Rhombus with GeoGebra

① This example demonstrates how to construct a rhombus in GeoGebra and illustrate its symmetry and the perpendicular bisecting property of its diagonals. ② Core mathematical concepts include quadrilateral classification, the definition of a rhombus, diagonal properties, and the geometric relationships of angle bisectors and perpendicular lines. ③ Construction highlights: Segment creates sides, Line builds auxiliary lines, AngularBisector draws angle bisectors, OrthogonalLine draws perpendiculars, Intersect finds intersection points, sequentially generating points A, B, C, D and labeling with text1. ④ Suitable for middle‑school geometry (grades 7‑9) as a construction demo, and also for high‑school analytic geometry review or teacher preparation materials.