Reflections in the Coordinate Plane by Wendy Sanchez

① This example demonstrates reflections (axial symmetry) in the coordinate plane, showing how points, segments, or polygons are mirrored across the x-axis, y-axis, or any arbitrary line, and how their coordinates change accordingly. ② The core mathematical concept is the reflection transformation in plane geometry, involving symmetry, coordinate correspondence, and invariant properties such as shape, size, and angle preservation. ③ The construction likely uses GeoGebra's geometric objects (points, segments, polygons) and transformation tools (reflection command), possibly with sliders or input boxes to dynamically adjust the mirror line, combined with a coordinate grid for easy reading of coordinates. ④ It is suitable for middle school to high school students learning plane geometry, coordinate geometry, or geometric transformations, and can be used for classroom demonstrations or student self-exploration.