1. ARGAND DIAGRAM
Learning Outcomes:
Know what is meant by an Argand Diagram (complex plane)
Be able to write a complex number in Polar Form
Be able to find the modulus r and argument θ of a complex number

2. modulus argument (used in Ex 7) principal argument polar form
Pythagoras
triangle
trigonometry
principal argument

4. modulus argument Q1 – x a y both positive
Example1: Find the modulus and argument (deg) of
argand diagram
modulus Re Im x y r
argument
Q1 – x a y both positive

5. Q4 – x positive, y negative
Example2: Find the modulus and argument (deg) of
argand diagram
modulus Re Im x y
Q4 – x positive, y negative r
argument

6. modulus argument polar form Example3: Express in Polar Form
argand diagram
modulus Re Im x y
argument r
polar form