z1,z2,z3,z4 are distinct complex numbers representing the vertices of a quadrilateral ABCD taken in order. If z1−z4=z2−z3 and arg[(z4−z1)(z2−z1)]=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 z1−z4=z2−z3 Implies AD||BC Hence opposites sides are parallel. Therefore its a type of parallelogram. Now arg(z4−z1z2−z1)=∠A =π2. Hence All the angles are 900 Therefore, it is rectangle.