The parabola's equation is in the standard form [math](y-k)^2=4p(x-h)[/math] (horizontal parabola) or [math](x-h)^2=4p(y-k)[/math] (vertical parabola). The equation that is displayed is in different format though. Choose horizontal or vertical parabola. You can change the equation of the parabola using sliders or by dragging the vertex. You can also drag point [math]A[/math].