Complex Numbers - Argand Diagram

What is an Argand Diagram?
An Argand diagram is a graphical way to represent complex numbers on a 2D plane, where:

• The x-axis (horizontal) shows the real part of the number.
• The y-axis (vertical) shows the imaginary part.

An Argand Diagram is a plot of complex numbers as points on the complex plane or Argand plane. The complex number z = x + yi is plotted as the point (x, y), where the real part is plotted in the horizontal axis and the imaginary part is plotted in the vertical axis.

The following diagram shows how complex numbers can be plotted on an Argand Diagram. Scroll down the page for more examples and solutions.

 

Complex Numbers Worksheets
Practice your skills with the following complex numbers worksheets:
Online & Printable Complex Numbers Worksheets

Key Features of an Argand Diagram

1. Axes:
   

• Horizontal Axis (Real Axis): This axis represents the real part of a complex number. Just like the x-axis in a Cartesian plane, values to the right of the origin are positive real numbers, and values to the left are negative real numbers.
• Vertical Axis (Imaginary Axis): This axis represents the imaginary part of a complex number. Just like the y-axis, values above the origin are positive imaginary numbers (multiples of the imaginary unit (i)), and values below are negative imaginary numbers.

2. Plotting Complex Numbers:
   

• A complex number (z = a + bi), where (a) is the real part and (b) is the imaginary part, is plotted as a point with coordinates ((a, b)) on the Argand diagram.
• The real part (a) determines the horizontal position, and the imaginary part (b) determines the vertical position.

FP1 Complex Numbers (Edexcel Further Pure Maths)
Argand Diagram Plotting

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How to Represent Numbers on an Argand Diagram?

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Basic complex analysis | Imaginary and complex numbers
Argand Diagram, magnitude, modulus, argument, exponential form

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