Construct a Sphere in GeoGebra

This example demonstrates how to use GeoGebra's Sphere command to create a three‑dimensional sphere. It covers core concepts in solid geometry, 3D coordinate representation, and the symmetry properties of spheres. The construction highlights the use of the Sphere command with a parameter a (radius or center point) and shows how sliders can animate the sphere's size or position. It is intended for high‑school or early university geometry classes and for 3D visualization in mathematics instruction.