Reflection in the line x = 1

This example demonstrates the reflection transformation of points and polygons across the line x = 1. It involves core mathematical concepts like reflection, coordinate geometry, and symmetry. The construction uses GeoGebra commands: Point, Polygon, OrthogonalLine, Mirror to create points, polygons, perpendicular lines, and reflected images. Suitable for high school coordinate geometry instruction or student exploration of geometric transformation properties.