

Origin
In two dimensions
On the flat
coordinate plane, there are two
axes, the vertical yaxis and the horizontal xaxis.
The origin is the point where they intersect. This point has the coordinates 0,0 and is usually labelled with the letter O.
In three dimensions
In the threedimensional coordinate system, in addition to the usual x and y
axes
there is a third, the zaxis, that goes in and out of the screen at right angles to the other two. The origin is the point O where all three axes intersect. This point has the coordinates 0,0,0.
Other Coordinate Geometry topics
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