1) If then magnitude or length or norm or absolute value of is 2) A vector of unit magnitude is unit vector. If is a vector then unit vector of is denoted by and 3) Important unit vectors are , where 4) The components of unit vectors of are called the direction cosines of , denoted by and 5) If, then are called directional angles of the vectors and 6) If and are the two points, then
7) If and then 8) If and is a scalar number, then.
9) In vector addition |