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[tex] \frac{z_1}{z_2} = \frac{11}{5} + \frac{2}{5}i [/tex]

Given that the origin, z1z2, z1/z2 and z3 are vertices of a rhombus, find z3.

I've drawn a sketch on a Argand diagram and the sketch is fine, but to find z3, they have done z1z2 + z1/z2 , but would this not give you a diagonal which joins z1z2 and z1/z2 instead of z3? How would it give you z3, if anyone could explain