An Argand Diagram is a plot of complex numbers as points on a 2D plane using the horizontal axis as the Real Axis and the vertical axis as the Imaginary Axis.
The Modulus of a complex number, |z|, is defined as the distance of z from the origin.
The Argument of a complex number, Arg(z), is defined as the angle of z anti-clockwise from the positive Real Axis. The principal argument lies in the range
Use the applet below to explore how a complex number can be represented in an Argand Diagram.
Drag around point z and observe how the modulus and argument of the complex number changes.