Just as you can see that the method to find the magnitude is similar in terms of 2 dimensional and 3 dimensional vectors, so is the addition, subtraction and scalar multiplication, dot and cross product of same.[br]I.e.:[math]\begin{matrix}x_1\\y_1\\z_1\end{matrix}+\begin{matrix}x_2\\y_2\\z_2\end{matrix}=\begin{matrix}x_1+x_2\\y_1+y_2\\z_1+z_2\end{matrix}[/math][br][br][math]u.v=u_x.v_x+u_y.v_y+u_z.v_z[/math][br][br][br]