Reflection in a Line

This example demonstrates the reflection of points and polygons across a line, involving core concepts like reflection symmetry, coordinate transformation, and geometric construction. It uses commands such as Line, Polygon, and Mirror with objects A, B, f, C, D, E, F, q1, c, d, e, f_1, C', D', E', F', q1', c', d', e', f' to illustrate the transformation process. Suitable for high school mathematics education to understand spatial transformations and geometric proofs.