Animated Sphere Demo

This example demonstrates the 3D shape and dynamic changes of a sphere through animation. Core math concepts include solid geometry, parametric equations, and function graphing. It uses GeoGebra's Surface command to generate the sphere, with parameters t and a controlling animation and size, plus text1 and text2 for annotations. Suitable for high school and above students learning solid geometry, parametric equations, and 3D visualization, or for educational demonstrations.