The figure shown in the image provided is called a sphere. Note that a sphere can be thought of as a round ball. In geometric terms, a sphere is defined as a set of points that are a given distance from a given point. The given point is called the center of the sphere and the given distance from the center of the sphere to the set of points that form the sphere is called the radius of the sphere.
The volume of a sphere can be calculated by the formula that is shown in the second image that is provided below.