noun
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geometrya three-dimensional geometric shape that is perfectly symmetrical around its center.
A sphere is a three-dimensional geometric shape that is perfectly symmetrical around its center. Every point on the surface of a sphere is the same distance from its center. This distance is known as the radius of the sphere.
A sphere with the radius .
A circle is a basic shape used throughout mathematics. A circle is defined as a shape where every point along its perimeter is an equal distance from its center.
The volume of a sphere is given by two-thirds multiplied by the circle constant τ (tau) multiplied by the radius cubed.