A point where the perpendicular number lines get bisected is called the origin of two dimensional space.

The two dimensional Cartesian coordinate system is actually formed by the perpendicular bisection of two number lines (or coordinate axes).

The coordinate axes are bisected perpendicularly at their middle point and their bisecting point is considered as a starting point for determining the position of any point on the plane. Hence, the perpendicular bisecting point of the coordinate axes is called the origin of two dimensional space.

In this example, the coordinate axes are $x$-axis and $y$-axis. The two coordinate axes are perpendicularly bisected at point $O$.

The point $O$ is called the origin of bi-dimensional Cartesian coordinate system and it is used as a starting point for determining the position of any point in the plane.

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