



 
Hi Cheyenne, The modulus of a complex number $z = a + bi$ is often written $z$ and is defined by \[z = a + bi = \sqrt{a^2 + b^2}.\] If you plot the point $z = a + bi$ in the complex plane, sometimes called an Argand diagram, then the modulus of $z$ is the distance from the origin to $z.$ It is nicely explained with diagrams on the mathcentre site in the UK. Penny  


Math Central is supported by the University of Regina and the Imperial Oil Foundation. 