Geometry

Expert replies

Previous Topic Next Topic

VenugopalGurram: Junior | Next Rank: 30 Posts; Posts: 13; Joined: Thu Nov 29, 2012 12:55 am

by VenugopalGurram » Wed Dec 12, 2012 1:42 am

What are the lengths of sides sides NO and OP in the triangle NOP below?

Like this post

Source: Beat The GMAT — Quantitative Reasoning | Wed Dec 12, 2012 1:42 am

Jim@StratusPrep: MBA Admissions Consultant; Posts: 2279; Joined: Fri Nov 11, 2011 7:51 amFollowed by: 266 members; Location: New York; Thanked: 660 times; GMAT Score:770

by Jim@StratusPrep » Wed Dec 12, 2012 8:27 am

These are similar triangles so NO/24 = 50/40, making NO 30 and then OP 50 because it is a multiple of a 3-4-5 triangle.

GMAT Answers provides a world class adaptive learning platform.
-- Push button course navigation to simplify planning
-- Daily assignments to fit your exam timeline
-- Organized review that is tailored based on your abiility
-- 1,000s of unique GMAT questions
-- 100s of handwritten 'digital flip books' for OG questions
-- 100% Free Trial and less than $20 per month after.
-- Free GMAT Quantitative Review

Like this post

ramv_fl: Newbie | Next Rank: 10 Posts; Posts: 4; Joined: Fri Apr 29, 2011 8:24 pm

by ramv_fl » Tue Apr 30, 2013 11:59 am

Jim@StratusPrep wrote:These are similar triangles so NO/24 = 50/40, making NO 30 and then OP 50 because it is a multiple of a 3-4-5 triangle.

If NP=50, how can OP be 50 and be a 3-4-5?

Like this post

srcc25anu: Master | Next Rank: 500 Posts; Posts: 423; Joined: Fri Jun 11, 2010 7:59 amFollowed by: 2 members; Location: Seattle, WA; Thanked: 86 times

by srcc25anu » Tue Apr 30, 2013 12:17 pm

They are similar traingles but their sides are NOT in the ratio of 3:4:5

40 / 50 = 24 / NO
NO = 30

OP = root(50^2 + 30^2)
OP = 10 root(34)

Like this post

Jim@StratusPrep: MBA Admissions Consultant; Posts: 2279; Joined: Fri Nov 11, 2011 7:51 amFollowed by: 266 members; Location: New York; Thanked: 660 times; GMAT Score:770

by Jim@StratusPrep » Mon May 13, 2013 8:41 am

Yeah, looks like I rushed that one... Point is they are similar triangles...

Like this post

GMAT/MBA Expert

ceilidh.erickson: GMAT Instructor; Posts: 2095; Joined: Tue Dec 04, 2012 3:22 pmFollowed by: 247 members; Thanked: 1443 times

by ceilidh.erickson » Fri May 17, 2013 9:15 am

Actually, unless we're given that angle ONP is a right angle, we can't actually prove that these are similar triangles, and thus the question is unsolvable. These triangles are similar only if we can prove that they have all equal angles. Just be sure to include all given information next time!

Ceilidh Erickson
EdM in Mind, Brain, and Education
Harvard Graduate School of Education

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 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