Triangle and Polygon Angle Sum Demo

This example demonstrates the Triangle Sum Theorem, Polygon Angle-Sum Theorem, and Exterior Angle Theorem using GeoGebra. It visually shows that the sum of interior angles in a triangle is 180 degrees, how the sum changes with the number of sides in polygons, and the relationship between exterior and interior angles. Construction involves commands like Segment, Angle, Polygon, and objects such as points A, B, C, angles α, β, γ, δ, and text elements. Suitable for middle school and above, helping students grasp polygon angle properties and theorem applications.