If z1, z2, z3 are vertices of an equilateral triangle, then:
Az1² + z2² + z3² = z1 z2 + z2 z3 + z3 z1
Bz1 = z2 = z3
CBoth might hold
Dz1 + z2 + z3 = 0
Answer & Solution
Correct answer: A. z1² + z2² + z3² = z1 z2 + z2 z3 + z3 z1
For equilateral triangle, the condition z1² + z2² + z3² = z1z2 + z2z3 + z3z1 holds (equivalently |z1 - z2| = |z2 - z3| = |z3 - z1|).
Sum z1+z2+z3 = 0 only when centroid is origin (a special case).
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