In the interactive figure, slide the sliders in the window on the right to change the values of [math]t[/math] (which move point [math]B[/math] along the curve) and of [math]\Delta t[/math] (which change the position of point [math]A[/math] in relation to point [math]B[/math]).

[i]Developed for use with Thomas' Calculus, published by Pearson.[/i]