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A, B, and C are three distinct points in the xy-coordinate

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A, B, and C are three distinct points in the xy-coordinate [#permalink] New post 22 Aug 2011, 11:18
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68% (01:49) correct 32% (01:00) wrong based on 62 sessions
A, B, and C are three distinct points in the xy-coordinate system, and line segment AB is either parallel to the x-axis or the y-axis. Do the points A, B, and C form the vertices of a triangle?

(1) The coordinates of point A are (4, 2).

(2) The coordinates of point B are (8, 2), and those of point C are (5, 7).
[Reveal] Spoiler: OA
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Re: Is ABC a triangle? [#permalink] New post 22 Aug 2011, 11:55
imerial wrote:
A, B, and C are three distinct points in the xy-coordinate system, and line segment AB is either parallel to the x-axis or the y-axis. Do the points A, B, and C form the vertices of a triangle?

(1) The coordinates of point A are (4, 2).

(2) The coordinates of point B are (8, 2), and those of point C are (5, 7).



Basically they will only not form a triangle if they all have the same x coordinate or the same y coordinate. (1) we are only given one point so it may form a triangle or may for a straight line. In (2) we can see that A and B have neither the same X or same Y coordinate, thus any other point on the grid will form a triangle with these two points. B
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Re: Is ABC a triangle? [#permalink] New post 22 Aug 2011, 12:32
imerial wrote:
A, B, and C are three distinct points in the xy-coordinate system, and line segment AB is either parallel to the x-axis or the y-axis. Do the points A, B, and C form the vertices of a triangle?

(1) The coordinates of point A are (4, 2).

(2) The coordinates of point B are (8, 2), and those of point C are (5, 7).


(1) A=(4,2);
For the sake of simplicity, let's say B=(5,2)
That makes AB || x-axis
Now,
C can be (6,2). ABC will form a straight line, not triangle.
Or,
C can be (10,10). ABC will form a triangle because the three points are NOT collinear.
Not Sufficient.

(2) B=(8,2) AND C=(5,7)

Because we are told that AB || some-axis, A must lie either on line y=2 OR x=8 considering B=(8,2) AND also A can't be (8,2) itself, for all the three points are distinct. Thus, ABC can not be collinear AND will always be a triangle irrespective of the coordinates A may have.
Sufficient.

See the pic:
Attachment:
AB_Parallel_To_Axis.JPG
AB_Parallel_To_Axis.JPG [ 31.36 KiB | Viewed 1434 times ]


Ans: "B"
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Re: Is ABC a triangle? [#permalink] New post 22 Aug 2011, 12:39
Just a side note: If "distinct" wasn't used in the question, C would have been the answer.!
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Re: Is ABC a triangle? [#permalink] New post 03 Nov 2011, 10:03
Good observation.
Re: Is ABC a triangle?   [#permalink] 03 Nov 2011, 10:03
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