Argand Diagrams  
Summary 
complex numbers cannot be shown on the number lines studied so far. e.g. real number line. complex numbers can be shown on the complex number plane known as an argand diagram. each number is represented by a point. the real part is plotted on the horizontal axis and the imaginary part on the vertical axis. 
Key Skills 

Vocabulary 
complex numbers, argand diagrams, real number, imaginary number 