Eight. That may be a big part of the reason why they're called "OCTants".
Or maybe it's just a coincidence.
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A Cartesian coordinate system is a coordinate system that specifies each point uniquely in a plane by a pair of numerical coordinates. These coordinate system can be used to provide geometric interpretations for many branches of mathematics.
Four.
There are four quadrants in a square co-ordinate system.
there are 4 quadrants in a coordinate grid (=
Possibly because the first time that pupils are introduced to the name and concept it is has only two dimensions. These are usually represented as horizontal (x) and vertical (y) coordinates. Actually, many children meet the concept - in its 1-dimensional form - as the number line. It is not called a Cartesian coordinate system then, and they make only simple use of it. The Cartesian coordinate system is normally extended to 3-dimensional space in high school coordinate geometry when it is obviously not called a plane, and to multi-dimensional hyperspaces in advanced mathematics or physics.