Geometric Construction and Dynamic Demo of Rectangle Area Formula

This example demonstrates the geometric meaning of the rectangle area formula and its relationship with length and width multiplication. Core concepts include rectangle properties, area calculation, and basic multiplication principles. The construction utilizes GeoGebra commands such as Point, OrthogonalLine, Intersect, Polygon, and Segment to define vertices A, B, C, D, forming polygon poly1 and calculating the Area. It is suitable for middle school and above students to understand geometric area derivation or for teachers to use in dynamic classroom demonstrations.