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hsgmat
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coordinate system 30 Oct 2005, 11:34
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Question from upstart raising:

Square PQRS is graphed in the standard coordinate plane. If the (x,y) coordinates of points P,Q and R are (2,1), (1,2) and (2,3) respectively, what are the coordinates of point S?

A.(3,1) B.(3,2) C.(3,3) D.(1,3) E(1,4)



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hsgmat
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coordinate system 30 Oct 2005, 11:44
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Got it!! It is (3,2)
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duttsit
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coordinate system 30 Oct 2005, 13:08
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As we can see the length of sides of square is:
sqrt((2-1)^1 + (1-2)^2) = sqrt(2)

only ans B (3,2) is same distance away from R (2,3).
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laxieqv
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coordinate system 31 Oct 2005, 06:21
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hsgmat
Question from upstart raising:

Square PQRS is graphed in the standard coordinate plane. If the (x,y) coordinates of points P,Q and R are (2,1), (1,2) and (2,3) respectively, what are the coordinates of point S?

A.(3,1) B.(3,2) C.(3,3) D.(1,3) E(1,4)
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There's a much shorter way as we make use of a characteristic of the symmetric point/ centre of a square
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ValleyBall1
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coordinate system 31 Oct 2005, 17:07
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B. (3,2) just from the eye.

laxieqv - wow!
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GMATT73
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coordinate system 01 Nov 2005, 00:21
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Eyeballing IS an officially recognized GMAT strategy as long as the the graph/image doesn`t specify note: not drawn to scale.



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