COORDINATE GEOMETRY OF THREE DIMENSIONS

This chapter discusses coordinate geometry of three dimensions. Mutually perpendicular straight lines intersecting at the origin are called the coordinate axes, and they determine three mutually perpendicular planes called the coordinate planes. The position of any point in space is determined uniquely by its directed distances from these planes. The coordinate planes divide space into eight octants. The chapter describes the coordinates of a point that divides the line joining two given points in a given ratio and explains the equations of a plane and a line. It also describes the angle between two directions.