We will now use vector algebra
to three dimensional geometry The purpose of this
approach to 3-dimensional geometry is that it makes the
study simple and elegant* In this chapter, we shall study the direction cosines
and direction ratios of a line joining two points and also
discuss about the equations of lines and planes in space
under different conditions, angle between two lines, two
planes, a line and a plane, shortest distance between two
skew lines and distance of a point from a plane Most of
the above results are obtained in vector form