If |z1|=|z2|=|z3|=|z4| and z1+z2+z3+z4=0 then the points z1,z2,z3,z4 in the Argand plane are the vertices of a
The points z1,z2,z3,z4 in the complex plane are the vertices of a parallelogram taken in order, if and only if
If |z1|=|z2|=|z3|=|z4|=1 and z1+z2+z3+z4=0 then least value of the expression E=|z1−z2|2+|z2−z3|2+|z3−z4|2+|z4−z1|2 is