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Question

If A(z1),B(z2),C(z3) are the vertices of the triangle ABC such that (z1z2)/(z3z2)=(1/2)+(i/2), the triangle ABC is

A
Equilateral
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B
Right angled
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C
Isosceles
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D
Obtuse angled
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Solution

The correct option is C Isosceles
z1z2z3z2=1+i2
Taking modulus we get
|z1z2z3z2|=1
|z1z2|=|z3z2|
Therefore, two arms of the triangle have equal length.
Hence the triangle is isosceles.

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