Pyramid Model: Rotating Regular Square Pyramid with Equilateral Triangular Faces

① This example demonstrates a regular square pyramid (pyramid model) in 3D, with rotation around its central axis, showing the square base, equilateral triangular side faces, and auxiliary internal lines. ② Core mathematical concepts include solid geometry of pyramids, regular polygon bases, equilateral triangles, symmetry axes, midpoints and segments, and spatial rotation logic. ③ Construction highlights: using GeoGebra commands Polygon to create the base square, Pyramid to generate the solid, Midpoint to find the center O and edge midpoints, Line and Segment to build the central axis and auxiliary segments; objects include vertices A, B, C, D, V, base poly1, edges a, b, c, d, e, side faces faceABV etc., central axis CentralAxis, and auxiliary points N, K, L, M. ④ Suitable for high school or early college students learning solid geometry, spatial reasoning, and 3D GeoGebra construction, also useful for demonstrating rotational symmetry in mathematical modeling.