Area of a Parallelogram - Interactive Demonstration

① This GeoGebra example interactively demonstrates how to compute the area of a parallelogram, allowing users to adjust parameters via input boxes and observe the resulting area changes. ② Core mathematical concepts include the parallelogram area formula (base × height), geometric transformations such as rotation and translation, and the relationship between area, base, and height, along with basic geometric elements like angles and vectors. ③ Construction highlights: Based on the construction summary, commands such as Point, Rotate, Angle, Ray, Circle, Intersect, Segment, and Line are used to build the figure, with Textfield and InputBox providing interactive controls. Objects include points A, B, C, D, segments a, b, c, d, etc., and texts text1, text2, text3, plus images pic1 and pic2 for labeling and auxiliary explanations. ④ Suitable for middle or high school geometry teaching, for teachers creating dynamic lesson materials, or for students exploring the derivation of the area formula through hands-on experimentation.