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Question

If the point (x,−1),(3,y),(−2,3) and (−3,−2) be the vertices of a parallelogram, then?

A
x=2,y=4
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B
x=1,y=2
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C
x=4,y=2
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D
None of these
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Solution

The correct option is A x=2,y=4
The points A(x,1),B(3,y),C(2,3),D(3,2) are the vertices of a parallelogram..
We know that diagonals of a parallelogram bisect each other.
Let O be the point of bisection.
AO=OC and BO=OD

O is the midpoint of AC as well as BD.
Considering AC, O(x22,1+32)

Considering BD, O(332,y22)

Equating the coordinates,

x22=0

x=2

y22=2

y=4

Option A is the correct answer

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