In the figure above, which of the following must equal 180?

Expert replies

Previous Topic Next Topic

AsadAbu: Senior | Next Rank: 100 Posts; Posts: 60; Joined: Tue Oct 13, 2015 9:05 am

by AsadAbu » Mon Aug 29, 2016 7:03 am

My confusion is given in the next post

Attachments

: Here is a screenshot from Kaplan book

Like this post

Source: Beat The GMAT — Problem Solving | Mon Aug 29, 2016 7:03 am

AsadAbu: Senior | Next Rank: 100 Posts; Posts: 60; Joined: Tue Oct 13, 2015 9:05 am

by AsadAbu » Mon Aug 29, 2016 7:05 am

In this question, there is no specific indication that 1) THE LINEs are straight lines and 2) all the LINEs go in a ONE particular POINT.
So, without these two important information HOW can we know that the opposite angles (e.g., angle b and angle e) are equal to each other?

From the figure, I know that b+a+g+h=180
Statement ii: Here, I've to prove that b+e+g+h=180 or not. If I can proof that angle 'a' and angle 'e' both are equal to each other then I can say surely b+e+g+h=180. In apparently it seems that angle 'a' and angle 'e' both are equal to each other but we've no information about...
1) THE LINEs are straight lines or not,
2) all the LINEs go in a particular POINT or not

Like this post

GMAT/MBA Expert

[email protected]: Elite Legendary Member; Posts: 10392; Joined: Sun Jun 23, 2013 6:38 pmFollowed by: 511 members; Location: Palo Alto, CA; Thanked: 2867 times; GMAT Score:800

by [email protected] » Mon Aug 29, 2016 9:09 am

Hi iMyself,

In PS questions, you are meant to 'trust' the picture (meaning that lines that 'look straight' are straight, the picture is drawn to scale, etc.); the exception is when the phrase "figure not drawn to scale" (or equivalent) is written under the picture. In addition, since each of the answers includes at least one of the Roman Numerals, there HAS to be a way to make a deduction about the angles involved in the picture. This is all meant to say that the lines are straight and they all intersect in one spot.

GMAT assassins aren't born, they're made,
Rich

Contact Rich at [email protected]

Like this post

GMAT/MBA Expert

Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Mon Aug 29, 2016 10:58 am

Here's a video on what can and cannot be assumed when dealing with GMAT diagrams: https://www.gmatprepnow.com/module/gmat ... /video/863

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

559 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review