RS Aggarwal Solutions for Class 8 Chapter 22 Introduces to Coordinate Geometry. A system of geometry where the position of points on the plane is described using an ordered pair of numbers. Recall that a plane is a flat surface that goes on forever in both directions. If we were to place a point on the plane, coordinate geometry gives us a way to describe precisely where it is by using two numbers. Introduction to Coordinate Geometry deals with how to plot the graphs, definition of order pair, about ordinate and coordinate, origin etc.