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Q.

Let z1,z2,z3  are the vertices of an equilateral triangle inscribed in the circle |z|=2 . If z1,z2,z3 are in the clockwise sense and z1=1+i3, then:

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a

z2=1−i3,  z3=−2

b

z2=1−i3,  z3=2

c

z2=1+i3,  z3=−2

d

z2=1+i3,  z3=2

answer is A.

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Detailed Solution

|z1|=|z2|=|z3|=2z1z2=z1z2e2πi/3⇒    z2=(1+i3)e−2πi/3 ⇒   z2=(1+i3)(−12−i32)⇒    z2=1−3iAlso    z3z1=z1z2e2πi/3⇒     z3=(1+i3)(−12+i32)=−2
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