Exploring Properties of Quadrilaterals

① This example demonstrates dynamic exploration of various quadrilaterals—parallelogram, rectangle, rhombus, square, trapezoid, kite—by dragging vertices to reveal their geometric properties. ② Core math concepts include definitions of quadrilaterals, parallel/equal opposite sides, diagonal properties, interior angle sum, and criteria for special quadrilaterals. ③ Construction highlights: GeoGebra commands Point, Polygon, Segment, and Angle create vertices A, B, C, D and polygon poly1, generating sides a, b, c, d, diagonals j, k, angles e, f, g, h, plus text labels text1, text2, etc., for annotation. ④ Suitable for middle‑school geometry inquiry, high‑school review, and teacher lesson preparation, enabling students to visually discover and prove quadrilateral properties.