Argand Diagrams (Leaving Cert Mathematics): Revision Notes

Argand Diagrams

An Argand diagram is a graphical way to represent complex numbers. The horizontal axis (real axis) represents the real part of a complex number and the vertical axis (imaginary axis) represents the imaginary part of a complex number.

A complex number in the form $a+bi$ is plotted as a point $(a,b)$.

Example

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Plot the complex number $2+3i$ on the Argand diagram.

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Plot the complex number $-2-3i$ on the Argand diagram.

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Plot the complex number $-2i$ on the Argand diagram.

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