Area and Perimeter of a Rectangle

This GeoGebra example demonstrates how dynamic adjustment of a rectangle's length and width real-time computes and displays its area and perimeter. It involves core mathematical concepts such as rectangle area and perimeter formulas, coordinate geometry, and two-dimensional vectors. Construction uses GeoGebra commands including Intersect, OrthogonalLine, Polygon, Perimeter, and Area, with vertex objects A, B, C, D and length parameters a, b to dynamically generate the rectangle and its measurements. Suitable for middle school geometry and high school parameterized geometry modules, it helps students intuitively understand rectangle properties and the variation patterns of area and perimeter, serving as an introductory case for parameterized geometric construction.