Triangle Geometry Construction and Properties Exploration

This example demonstrates how to create a custom triangle ABC using GeoGebra and explore its geometric properties. The core mathematical concepts include triangle angle sum, exterior angle theorem, and side-angle relationships. Construction details: Using the CustomTriangle command to create triangle objects, with points A, B, C and auxiliary elements f, g, h, text t1 for dynamic demonstration. Suitable for middle and high school students to understand basic geometric concepts and practice geometric construction skills, also useful for teachers as an interactive tool for demonstrating triangle properties.