Sum of Interior Angles of a Polygon (Dynamic Demonstration)

This GeoGebra example demonstrates the sum of interior angles of a polygon as the number of sides changes, visually illustrating the (n−2)×180° rule. Core mathematical concepts include the polygon interior angle sum theorem, convex polygon properties, angle measurement, and sequences. Construction highlights: the example uses GeoGebra commands such as Sequence to generate vertex sequences, Polygon to construct polygon objects, and LaTeX for angle labels and computed results; key objects include sides, conv, poly, sidelist, text2, and various list/operation variables for slider-driven control. Suitable for middle school geometry and high school mathematics instruction, classroom demonstration, and independent exploration.