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 Related Terms
 Sphere:  The set of all points in space that are equidistant from a fixed point, called the center.
Circle: The set of all points in a plane that are the same distance, called the radius, from a given point, called the center.
Hemisphere: One of the two halves of a sphere when it is intersected with a plane passing through the center.
Solid: A figure that has length, width, and thickness (i.e., a figure that is 3-dimensional).
Three-Dimensional Figure: Figures that have length, width, and thickness.