# Dimension of a Space

April 6th Fact-of-the-DayThe number of coordinates
needed to specify a point in a space is the dimension of the space.
For example, a line is a one-dimensional space, because any point on a
line relative to a reference point on that line can be specified with
a single value. A plane has two dimensions, because two coordinate values
are needed to specify the location of a point on a plane relative to a
reference point on the same plane. The physical space we see has three-dimensions
at any point in time, because three coordinate values are needed to specify
the location of a point within that space with respect to a reference
point within the same space. However, if a point of interest changes position
within that three-dimensional space over time, a fourth coordinate (time)
must be specified, resulting in a four-dimensional space. If your position
has or ever will change in three-dimensional space, you live in a space
that has at least four dimensions. *©2005 Martek International All rights
reserved.*

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