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Geometry - Easy data sufficiency

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by ruwan_s » Mon Oct 13, 2014 10:49 am
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Please check the image for the question before reading.

I have a question about this relatively easy problem. For me to get the right answer I have to assume AE and BF are straight lines, that angle p + r = 180. Is this a bad assumption?

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Source: — Data Sufficiency |

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by [email protected] » Mon Oct 13, 2014 11:11 am
Hi ruwan_s,

You ask a really important question. Thankfully, the answer is clear and simple - the OG (and each of the corresponding Official materials) states that "straight lines" should be considered to be straight lines (even if they are diagonal lines). In other words, we're meant to assume that AE and BF ARE straight lines.

From the picture, you might be tempted to assume that angleP is greater than angleR, but THAT is not necessarily the case.

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by Brent@GMATPrepNow » Mon Oct 13, 2014 11:31 am
Hi ruwan_s,

We have a free video that covers all of the assumptions one can make regarding the diagrams that accompany GMAT geometry questions: https://www.gmatprepnow.com/module/gmat-geometry?id=863

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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by ruwan_s » Tue Oct 14, 2014 7:07 pm
Thank you, Rich and Brent.
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