VECTOR ALGEBRA | VECTOR JONING TWO POINTS, DIRECTION COSINES AND DIRECTION RATIOS | Position vector in 2 dimensional plane and 3 dimensional plane, Components of vector joining two point in 2 and 3 dimensional plane, Direction cosines, Direction ratios, Direction cosines of of a vector, Direction ratio of the line segment joining two points, Two parallel vectors have proportional direction ratios and representation of vector `r` in terms of direction ratios., Projection of vector along coordinate axes; if direction cosine is given