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Kite - A quadrilateral with two disjoint pairs of congruent adjacent sides.
Parallelogram - A quadrilateral with two pairs of parallel sides.
Rectangle - A parallelogram with four angles of equal size (right angles).
Rhombus - A parallelogram with four sides of equal length.
Square - A parallelogram with four sides of equal length and four angles of equal size (right angles).

Now the above statements are a variant of many available definitions of these shapes. This definitions also implies other properties of the shapes. For example, the diagonals of a parallelograms always bisect each other.


Statement 1: This implies ABCD is a parallelogram --> Not sufficient

Statement 2: Only one right angle does not ensure that ABCD is a rectangle --> Not sufficient

1 & 2 Together: ABCD is a parallelogram with one right angle. This implies other three angles of ABCD are also right angles. Hence, ABCD is a rectangle --> Sufficient

The correct answer is C.

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The word rectangle comes from the latin 'rectus' meaning 'right', so a rectangle is just any quadrilateral with four right angles. That includes squares - squares are a special type of rectangle in which all the sides are of equal length. So yes, the shape could be a square, but then it is also a rectangle.

I have never seen the word 'rhombus' or 'kite' in a real GMAT question, and I've seen several thousand of the things, so I would be very, very surprised if you saw either of those words on test day. Of course you could see a shape in a diagram which happens to be a kite, say, but you'd always be able to work out from the diagram the answer to the question without needing to have memorized any special properties of kites.

You should certainly understand squares, rectangles and parallelograms, however - how to find their areas, and the simple facts about their angles (specifically, in a parallelogram, opposite angles are equal and adjacent angles add to 180).

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