How to find minimal distance [Beginner]

Hello everybody,

I have a small question;

I have two matrices: A(2099x2) and B(9x2).

Matrix A = trajectory (x,y)

Matrix B = position of 9 targets ( X,Y)

I would like to know how to calculate the distance (red arrows) of the nearest-neighbor of a point between the trajectory (blue line) and the targets( red squares). Thanks in advance