From the above figure, it can be seen that -axis and -axis taken together determine a plane known as plane.
Any point in space can be represented with the help of three points , where , and represent its distance from the origin along the , and -axis respectively.
Since the given point lies in the plane, its distance from the origin along the -axis is zero.
Therefore, the coordinates of the given point are of the form ,
From the above figure it can be seen that the coordinate planes divide the space into octants.