A vector in geometry is a directed segment that is characterized by an ordered pair of points in Euclidean space.
The length of a vector is a number that is equal to the length of the segment of the forming vector.
Find the square of the length of the vector. It is equal to the sum of the squares of its coordinates. That is, it is necessary to square each coordinate and add the results.
Let us find the length of the vector directly. It is equal to the square root of the sum of the coordinates of the vector. The newly obtained number and will be the length of the original vector.