what are the complex numbers

If z_1,z_2 are two complex numbers representing two consecutive vertices of a square then what is the complex number represented by the centre of the square ?

What is the product of the complex numbers (−3i+4) and (3i+4)?

In the figure , Z represents a complex number. Write the complex number in polar form.

Conjugate of the complex number is 1/(1-i) then complex number is ............

What is the argument of the complex number (-1-i) where i=sqrt(-1)?

What is the arugument of the complex number ((1+i) (2+i))/(3-i) where =sqrt(-1) ?