Area of a Parallelogram - Interactive GeoGebra Demo

① This GeoGebra example demonstrates the area of a parallelogram through an interactive construction, showing how the area is computed and how an incircle and special points relate to the shape. ② Core math concepts include the parallelogram area formula (base × height), polygon area, properties of incircles, and special points such as midpoints and perpendicular feet, involving arithmetic and natural number operations. ③ Construction details: using commands like Line, Intersect, Polygon, Point, and Segment, the construction includes vertices A, B, C, D, sides a, b, c, d, polygons poly1 and poly2, auxiliary lines g, h, i, j, and text objects text1 and text2 displaying area values. Users can drag points to see how the area changes dynamically. ④ Suitable for middle school geometry lessons, elementary math enrichment, or teacher demonstrations, helping learners intuitively grasp the area formula and explore relationships between parallelograms and incircles.