D.S Geom

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D.S Geom

by Nidhs » Fri Feb 01, 2008 12:26 pm
If Q is a quadrilateral, is Q a rectangle?
1) Opposite sides of Q are parallel.
2) One of the four angles of Q is 90 degrees.

The ans according to the book is C...but doesn't a square also satisfy the above points?
Source: — Data Sufficiency |

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Re: D.S Geom

by Stuart@KaplanGMAT » Fri Feb 01, 2008 12:59 pm
Nidhs wrote:If Q is a quadrilateral, is Q a rectangle?
1) Opposite sides of Q are parallel.
2) One of the four angles of Q is 90 degrees.

The ans according to the book is C...but doesn't a square also satisfy the above points?
Yes. However, a square is just a special kind of rectangle with 4 equal sides.

So, if something is a square, it's also a rectangle (but not vice-versa).

On a side note, if something is a square it's also a parallelogram and a rhombus.
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by Nidhs » Fri Feb 01, 2008 2:08 pm
This is because a square satisfies all the properties of a rectangle and rhombus...right?

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by Stuart@KaplanGMAT » Fri Feb 01, 2008 4:15 pm
Nidhs wrote:This is because a square satisfies all the properties of a rectangle and rhombus...right?
Correct!
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