Braingle: 'X is a Y' Brain Teaser

X is a Y

Logic puzzles require you to think. You will have to be logical in your reasoning.

Puzzle ID:	#1555
Fun:	(2.13)
Difficulty:	(1.88)
Category:	Logic
Submitted By:	sam7630
Corrected By:	Omaha345

An X is a Y, but a Y is not an X.

Replace X and Y with words to make the sentence make sense.

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Answer

a SQUARE is a RECTANGLE, but a RECTANGLE is not a SQUARE.
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Comments

maneesh Dec 02, 2001	That way there could be many solutions.. 1.A rhombus is a quadrilateral but a quadrilateral is not a rhombus Similarly many pairs like Square - Quadrilateral Rectangle - Quadrilateral Isoscles Triangle-Triangle Equilateral Triangle-Triangle Right Triangle-Triangle ..and lot more
gilmoregirlsfan Jun 09, 2005	I learned ALL of thoose in the fifth grade!
paul726 Mar 05, 2006	Also, a square is a rectangle, but a rectangle is not NECESSARILY a square. That is, it can be one.
stil Apr 29, 2006	Wrong category. Geometry can involve computation, but all I see in this teaser is definition.
tonjawithaj Sep 05, 2006	Good one, but I agree that there are MANY answers to this.
lessthanjake789 Sep 14, 2006	math isnt even necessary. along the same lines of Y is not necessarily X - a spoon is a utensil but a utensil is not (necessarily) a spoon. or any inclusive thing to a larger group. the list goes on and on.
7mi27 Jul 01, 2008	I agree, the question wasn't phrased very well...
efurosibina Jun 29, 2011	the teaser was not phrased properly.anything could stand for X and Y.