Trapezoid Area Inequality Demo

① This example shows how to construct a trapezoid in GeoGebra and dynamically illustrate the relationship between its area and an associated inequality. ② Core mathematical concepts include polygon area computation, inequality derivation, polynomial function graphs, and geometric constructions such as the orthocenter. ③ Construction highlights: Polygon creates the two trapezoids (poly1, poly2); Ray and Point define vertices; Intersect finds intersection points; the command objects m, A, B, C, D, a_1, b, c, d, e, P, Q, R, S, p, q, r, s, X drive the construction. ④ Suitable for high‑school geometry and algebra integration lessons, as well as university‑level geometric modeling demonstrations.