Find all School-related info fast with the new School-Specific MBA Forum

It is currently 21 Oct 2014, 03:09

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Question on DS help page

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 13 Jun 2006
Posts: 7
Followers: 0

Kudos [?]: 0 [0], given: 0

Question on DS help page [#permalink] New post 13 Jun 2006, 14:46
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
The first question on the DS page is below. Why does it have to be a 3-4-5 and a 5-12-13 triangle? Why couldn't the 12 be the hypotnuse thus making the triangle have sides 5-10.9-12 since we do not know which sides are what, thus not giving us enough information to solve the problem?

Example 1. Triangle ABC has one angle equal to 90 degrees and AB equal to 5 inches, what is the area of ABC?


(1) BC = 4
(2) AC = 12
Apparently both answer choices are sufficient to answer the question, but in two cases, the numeric answer differs. In the first case we get a 3-4-5 triangle and in the second 5-12-13, thus area of ABC1 is 6 and ABC2 is 30.
VP
VP
User avatar
Joined: 29 Dec 2005
Posts: 1351
Followers: 7

Kudos [?]: 28 [0], given: 0

Re: Question on DS help page [#permalink] New post 13 Jun 2006, 17:24
Alanjackson wrote:
Triangle ABC has one angle equal to 90 degrees and AB equal to 5 inches, what is the area of ABC?

(1) BC = 4
(2) AC = 12


it is not necessary to have 3-4-5 or 5-12-13 to have a right angle triangle if the given information is not sufficient as above. right angle triangle can have different measurements of sides. however, no matter the sides of the right angle triangle, it must hold a relationship of its sides as h^2 = l^2 + b^2.

the question seems poorly structured because st 1 and 2 each alone are not sufficient to find the area of the triangle. combined 1 and 2 also doesnot make any triangle.

H could have any value in 1 and 2. in 1, it could be 5 or sqrt(41). in 2, it could be 12 or 13.

so OA you have might be C but it doesnot make any sense.
CEO
CEO
User avatar
Joined: 20 Nov 2005
Posts: 2922
Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
Followers: 15

Kudos [?]: 81 [0], given: 0

 [#permalink] New post 13 Jun 2006, 20:21
What a question:

St1: This leads to either 3-4-5 or 4-5-SQRT(41). INSUFF

St2: This leads to either 5-12-13 or 5- SQRT(119)-12 : INSUFF

Combined: 4-5-12 is not a triangle. :shock: :shock:
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

SVP
SVP
avatar
Joined: 30 Mar 2006
Posts: 1741
Followers: 1

Kudos [?]: 28 [0], given: 0

 [#permalink] New post 13 Jun 2006, 20:27
E
1) Not suff
We dont know 5 and 4 are what? base altitute or Hyp

2) Not suff
We dont know 5 and 12 are what? base altitute or Hyp

Together

5-4-12 is not a right triangle
Manager
Manager
User avatar
Joined: 29 Sep 2005
Posts: 126
Followers: 1

Kudos [?]: 1 [0], given: 0

 [#permalink] New post 14 Jun 2006, 04:53
jaynayak wrote:
E
1) Not suff
We dont know 5 and 4 are what? base altitute or Hyp

2) Not suff
We dont know 5 and 12 are what? base altitute or Hyp

Together

5-4-12 is not a right triangle


I agree with E however,

1) We do know that 4 is either base or height (not the longest side)

What we do not know is what 5 is

2) We do know that 5 is either base or height not the longest side. we do not know what 12 is.

Combining 1 and 2 logically we get 4 from st 1 and 5 from st 2 and should be sufficient to find the area, however the pythagoras theorm does not hold.

I feel like the concepts being tested here are:

Base + Height > Hypo

Hypo is the longest side


Maybe someone else can shed some light?
So I would have to go with E.
Intern
Intern
avatar
Joined: 13 Jun 2006
Posts: 7
Followers: 0

Kudos [?]: 0 [0], given: 0

 [#permalink] New post 14 Jun 2006, 06:08
All very helpful. It appears that this should be switched to reflect your answers on the website. I think there is also an error on another one of the DS examples on the help page. I have just posted it as a new topic so please take a look at and help provide the right answer.
  [#permalink] 14 Jun 2006, 06:08
    Similar topics Author Replies Last post
Similar
Topics:
Math DS questions - Help with solution vidyanan 3 13 Jun 2007, 07:11
1000 PS and DS questions. HELP !!!!!!!!!! JyotiBharadwaj 2 24 Apr 2007, 02:41
Question on DS help page, Example 6 Alanjackson 6 14 Jun 2006, 06:12
help req for one DS question Sashi 2 06 Jun 2006, 04:49
Help Needed for DS question Yogendras 1 29 Dec 2005, 22:59
Display posts from previous: Sort by

Question on DS help page

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.