# Complex Numbers 3 - Modulus and argument

The modulus and argument of a complex number.

[list=1] [*] Move [color=#0000ff]$z$[/color] and see how the modulus [color=#ff0000]$|z|$[/color] and the argument [color=#006400]$\arg(z)$[/color] change. [*] In particular, observe that [color=#006400]$0\leq\arg(z)<2\pi$[/color] and [color=#ff0000]$|z|\geq0$[/color] [/list]