Answer :
Here given points are A (2, 0), B (9, 1), C (11, 6) and D (4, 4).
For a quadrilateral to be rhombus, all sides must be equal.
By distance formula,
XY = 
For side AB,
AB = 
= 
= 
units.
For BC,
BC = 
= 
= 
units
CD = 
= 
= 
units.
AD = 
= 
= 
units.
Here all sides are unequal.
Hence □ABCD is not a rhombus.
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