Pyramid Cross Section with Inscribed Sphere

① This GeoGebra example dynamically demonstrates the cross-section polygon of a pyramid (quadrilateral pyramid) cut by a plane, along with an inscribed sphere and related geometric elements. ② Core mathematical concepts include solid geometry cross-sections, inscribed spheres, vertices and edges of a pyramid, and measurements of distances and angles. ③ Construction highlights: uses Polygon and Pyramid commands to build the base and pyramid, Translate to create auxiliary planes, IntersectPath to obtain the intersection path, OrthogonalLine and Intersect for perpendiculars and intersections, Angle and Distance for measurements, Segment and PointIn for marking key segments and points, and text labels for clarity. ④ Suitable for high school solid geometry or college-level geometric visualization, helping students understand how the cross-section changes with the cutting plane and the relationship between the inscribed sphere and the pyramid.