Sphere Construction in GeoGebra

①This example demonstrates how to construct a sphere in GeoGebra's 3D view by specifying a center point and a point on the sphere, visualizing the sphere's geometric form. ②The core mathematical concept is the definition of a sphere in solid geometry: the set of all points in space at a fixed distance (radius) from a given point (center), involving points, distances, and basic elements of 3D space. ③Construction highlights: from the construction summary, the Point command is used to create points A and B, with A as the center and B as a point on the sphere; then the Sphere command generates sphere a with center A and radius determined by B. The construction is minimal, relying only on two points and one sphere object. ④This is suitable for upper middle school or high school students first learning about spheres in solid geometry, and for teachers to demonstrate basic 3D construction methods in class, helping students develop spatial visualization skills.