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A point
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.
A point has zero dimensions; a line has only one direction, which is length. Two-dimensional objects have length and width, and therefore area.
0. A triangle is a 2-dimensional object and so its volume - which requires a 3-dimensional object - is always zero.
ZERO Space, because SPAce IS A 3-DIMENSIONAL FEATURE. 2-DIMENSIONAL FEATURES occupy no space , because there is no third dimension.