GMATinsight wrote:

Is Quadrilateral ABCD a Rhombus?

1) Diagonals of ABCD Bisect each other at 90 degrees

2) Diagonals of ABCD are equal in dimension

Source:

http://www.GMATInsight.comGood question. The word BISECT should not be ignored.

Diagonals of Quadrilateral

intersect each other at 90 degrees: Quadrilateral can be Rhombus or Kite.

Diagonals of Quadrilateral

Bisect each other at 90 degrees: Quadrilateral is definitely a Rhombus! Hence, Statement-1 is sufficient.

Diagonals of Quadrilateral are equal in dimension: Quadrilateral can be Square (note that Square is a Rhombus with each interior angle as 90 degrees) or Rectangle or a Trapezium with equal non-parallel sides. Hence, Statement-2 is insufficient.

Answer: A.

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