This MEI interactive resource for complex numbers demonstrates loci in the Argand diagram.
The 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 and 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). The excel file uses sliders to alter the position of the point on the plane.
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