The following activity allows the user to experiment with changing the complex numbers [math]a[/math] and [math]b[/math] by moving them as points in the complex plane [math]\mathbb{C}[/math]. The results of addition, multiplication, and division are also visualized as points in the same plane. The circle represents all complex points [math]z[/math] where [math]||z||=||a||[/math].