This MEI online interactive resource for complex numbers demonstrates the Argand diagram.

This flash file can be used to plot a point in the complex plane. In this plane on the horizontal axis are the real numbers and on the vertical axis are the imaginary numbers. The point can be picked up an moved into all four quadrants. Each complex number can be defined by its distance from the origin (modulus) and angle (in radians) from the positive real axis (argument). Each of which can be viewed of hidden.

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