Orthogonal Cartesian Co-ordinate:

Orthogonal Cartesian Co-ordinate is a system

of Cartesian coordinate in a plane.It established

a biunivocal relationship between points in the

plane and pair of real numbers.

The pair of number x and y written as (x,y)

represents the position of the point in a plane

with reference to an arbitrarily choosen origin

o,which is the point of intersection of two

mutually perpendicular lines XOX’ and YOY’

known as x-axis and y-axis respectively.