'Normal' numbers such as 1, 3.6, -19.678 can be represented by a point on a line: their value is the distance from 0
Engineers and scientists extend these to complex numbers which involve i or j representing the squareroot of -1
These have a 'real' part and an 'imaginary' part (the number multiplied by i or j) : we use j here
They can be represented by a point on a 2D graph - the horizontal axis for real, the vertical for imaginary
They can be considered to have a modulus (distance from 0) and an angle (from the real axis)
It can be very useful having a number which has a size and an angle ...
This program allows you to specify complex numbers, see them on the 2D graph, represented in either format
You can also see the result of adding, subtracting, multiplying or dividing two complex numbers.
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