Concave Polygon Demonstration

This example demonstrates the construction and properties of concave polygons. It involves core mathematical concepts such as polygon definition, angle measurement, and line segment connection. The construction uses GeoGebra commands Segment (line segment) and Angle (angle), with objects including points A, B, C, D, E and angles α, β, γ, δ, ε. It is suitable for high school mathematics education, helping students understand the geometric characteristics and construction methods of concave polygons.