Four Parallelogram Properties Part 2

This example demonstrates the properties of a parallelogram where opposite angles are congruent and consecutive angles are supplementary. It involves core math concepts like parallelograms, angles, and symmetry. Constructed using GeoGebra commands like Segment and Angle, with objects such as text1, text2, text3, A, B, a, C, b, D, c, d, α, β, γ, δ, ε, ζ, η, θ, text4_1, text7, text6, text5. Suitable for middle school and above students for exploring geometric properties dynamically.