ramps, door stops, and stairs. I think.
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Parallel lines are two 1-dimensional objects that do not meet. Parallel planes are two 2-dimensional objects that do not meet.
9 planes in Cube 3 Planes in Cuboid
Inclined Planes allow heavy objects to be moved up or down using less effort over a greater distance.
Zero. Points are zero dimensional objects. Straight lines are one dimensional objects. Planes and surfaces are two dimensional objects. Volumes and polyhedra are examples of three dimensional objects.