Bases and Heights of Parallelograms: IM 6.1.5 Activities 1-3

① This example shows how to construct a parallelogram in GeoGebra and dynamically display the relationship between its bases and corresponding heights. ② Core mathematical concepts include the area formula for parallelograms, definitions of base and height, and vector translation preserving parallelogram properties. ③ Construction highlights: Polygon creates the quadrilateral, Segment draws edges, Vector defines the translation vector, Translate moves the whole figure producing vertices A',B',C',D' and a new polygon poly1'. ④ Suitable for middle‑school geometry (grades 6‑8) and teacher lesson demonstrations, helping students visualize base‑height correspondence and area invariance.