Rectangle Perimeter: Solving Linear Equations

① This example demonstrates how to generate random application problems about the perimeter of a rectangle, converting real-world situations into linear equations and solving them dynamically with visual feedback. ② Core math concepts include linear equations, one-variable equation modeling, the rectangle perimeter formula (2×(length+width)), and verification of solutions. ③ Construction highlights: using GeoGebra's Random command to generate random length and width, drawing the rectangle with Polygon, Segment, Angle, and Distance commands, labeling sides, providing Textfield and InputBox for user input, a button1 to check answers, and variables like perminus/perplus to show perimeter errors with dynamic text updates. ④ Suitable for middle school algebra classes focusing on linear equation applications, and useful for teachers demonstrating equation modeling or students practicing problem-solving with geometric visualization.