Space figures are figures whose points do not all lie in the same plane.
Space in geometry is an undefined term, it is the ideas of a point, line, and plane are undefined.
When you have a plane it moves into space of three sets, the points on the plane and two half spaces.
The term polyhedron comes from the space figures. The defention for polyhedron is a figure in space whose sides are polygonal regions.
A good website to learn more about space figures is this one.
Some examples of space figures and polyhedrons are:
Each one of these is apart of a space figure because all of the points on each of these has points that do not lie on the same line.
Another good website for space figures, and polyhedrons is
http://www.kidsnewsroom.org/elmer/infocentral/geometry/SpaceFigures.html
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