Complex Modulus/Examples/z1 + z2/Proof 1

Proof
An illustration of the modulus of the sum of the complex numbers:
 * $z_1 = 4 - 3 i$
 * $z_2 = -1 + 2 i$

is given below:


 * Complex-Modulus-z1+z2.png

The modulus is seen to be the radius of the circle.