Crown Line of Reflection Symmetry

① This example demonstrates a reflection symmetry line passing through a crown‑shaped figure, showing the mirror correspondence of the shape across that line. ② Core mathematical concepts include reflection transformations, axial symmetry, straight‑line construction in geometric drawing, and vertex correspondence in triangles. ③ Construction highlights: the GeoGebra Line command creates lines a, b, c sequentially, while points C, D, E, F, A, B define the symmetry axis and matching points; auxiliary text text1 and image pic1 label key steps. ④ Suitable for middle‑school geometry lessons on axial symmetry, high‑school analytic geometry review of reflections, and as a geometric construction practice resource.