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The spatial geometry of a semicircle that rotates around the diameter of a circle is called a sphere. Referring to the sphere, the radius of the semicircle is the radius of the sphere. A sphere is a solid figure with one and only one continuous surface. This continuous surface is called a spherical surface.
The orthographic projection of the sphere on any plane is an equal circle, and the diameter of the projection circle is equal to the diameter of the sphere.
Definition: The spatial geometry of a semicircle that rotates around the diameter of a circle is called a sphere. The figure shown in the figure is a sphere.
A sphere is a solid figure of a continuous curved surface, and a geometry surrounded by a sphere is called a sphere.
There is no absolute sphere in the world. Absolute spheres exist only in theory.
But in a weightless environment (such as space), the droplets automatically form an absolute sphere.