Vectors

It looks like we are trying to find the magnitude of this vector.

We can use Pythagoras' theorem to calculate this:

||v|| = √( x² + y² )

||v|| = √( (4)² + (3)² )

||v|| = √( 16 + 9 )

||v|| = √25

||v|| = 5

 

Source: http://www.mathsisfun.com/algebra/vectors.html