## Vector Length

Given a vector V with tail at the origin and head at b = (x

_{b}, y_{b}), what's its length?According to Pythagoras, the length of the hypoteneuse is the square root of x

_{b}^{2}+ y_{b}^{2}.You can move b around and calculate the length of a few favored vectors. But suppose you come across a vector whose tail is not so nicely situated?

Apply Pythagoras again.