# A calculus of the absurd

##### 14.2.3 Polar co-ordinates and complex numbers
We can also define complex numbers differently (i.e. not using Cartesian co-ordinate system). Instead of identifying each complex number using an $$x$$ (real) and $$y$$ (imaginary) co-ordinate, we can instead define it using an angle ($$\theta$$) and a distance from the origin ($$r$$).