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Question

z1,z2,z3,z4 are distinct complex numbers representing the vertices of a quadrilateral ABCD taken in order. If z1z4=z2z3 and arg[(z4z1)(z2z1)]=π/2, then the quadrilateral is

A
rectangle
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B
rhombus
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C
square
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D
trapezium
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Solution

The correct option is B rectangle
Let
A=z1
B=z2
C=z3
D=z4
Hence
z1z4=z2z3
Implies AD||BC
Hence opposites sides are parallel. Therefore its a type of parallelogram.
Now
arg(z4z1z2z1)=A
=π2.
Hence
All the angles are 900
Therefore, it is rectangle.

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