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Figures Drawn to Scale in PS?

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Figures Drawn to Scale in PS? [#permalink] New post 08 Nov 2009, 16:45
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Hi there,

Some forums on the internet mention that figures in the PS section are always drawn to scale. If not, it is indicated that the figure is not drawn to scale.

However, I just came across a problem in on of the MGMAT cats that handles this issue otherwise (take a look at the attachment).

So is it true that we can expect figures to be drawn to scale on the PS section on the actual GMAT or not?

Thanks
Steve
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Re: Figures Drawn to Scale in PS? [#permalink] New post 08 Nov 2009, 16:58
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Well it's obvious that this figure IS NOT drawn to the scale, as x=90 degrees and at the figure it's not so.

I asked the similar question to the GMAT tutor Ian Stewart and he kindly gave me explanation. So, below is how GMAT draws the diagrams:

"In general, you should not trust the scale of GMAT diagrams, either in Problem Solving or Data Sufficiency. It used to be true that Problem Solving diagrams were drawn to scale unless mentioned otherwise, but I've seen recent questions where that is clearly not the case. So I'd only trust a diagram I'd drawn myself. ...

Here I'm referring only to the scale of diagrams; the relative lengths of line segments in a triangle, for example. ... You can accept the relative ordering of points and their relative locations as given (if the vertices of a pentagon are labeled ABCDE clockwise around the shape, then you can take it as given that AB, BC, CD, DE and EA are the edges of the pentagon; if a line is labeled with four points in A, B, C, D in sequence, you can take it as given that AC is longer than both AB and BC; if a point C is drawn inside a circle, unless the question tells you otherwise, you can assume that C is actually within the circle; if what appears to be a straight line is labeled with three points A, B, C, you can assume the line is actually straight, and that B is a point on the line -- the GMAT would never include as a trick the possibility that ABC actually form a 179 degree angle that is imperceptible to the eye, to give a few examples).

So don't trust the lengths of lines, but do trust the sequence of points on a line, or the location of points within or outside figures in a drawing. "

Hope it helps.
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Manager
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Re: Figures Drawn to Scale in PS? [#permalink] New post 08 Nov 2009, 17:22
Thanks Bunuel. That helps alot!
Re: Figures Drawn to Scale in PS?   [#permalink] 08 Nov 2009, 17:22
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