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

It is currently 20 Sep 2014, 18:45

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

In triangle ABC above, what is the lenght of side BC? 1)

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 24 Jun 2006
Posts: 130
Followers: 1

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

GMAT Tests User Reviews Badge
In triangle ABC above, what is the lenght of side BC? 1) [#permalink] New post 16 Jul 2007, 12:44
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

20% (01:37) correct 80% (00:17) wrong based on 13 sessions
In triangle ABC above, what is the lenght of side BC?

1) line segment AD has lenght 6

2) x=36


OA later explain reasoning
Attachments

atriangle.JPG
atriangle.JPG [ 3.03 KiB | Viewed 1820 times ]

Senior Manager
Senior Manager
avatar
Joined: 06 Mar 2006
Posts: 497
Followers: 7

Kudos [?]: 76 [0], given: 1

GMAT Tests User
 [#permalink] New post 16 Jul 2007, 13:03
Where is the figure? Without the figure, it is kind of hard to picture where x is and where point D lies.
Manager
Manager
avatar
Joined: 24 Jun 2006
Posts: 130
Followers: 1

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

GMAT Tests User Reviews Badge
 [#permalink] New post 16 Jul 2007, 13:06
don't you see it?? i ve attached it with the post... :? ????
1 KUDOS received
Senior Manager
Senior Manager
avatar
Joined: 06 Mar 2006
Posts: 497
Followers: 7

Kudos [?]: 76 [1] , given: 1

GMAT Tests User
 [#permalink] New post 16 Jul 2007, 13:57
1
This post received
KUDOS
Sorry, I did see it now.

The answer should be A.

We know from the figure that <BAC=x , <BDC=<BCD=2x
So BD=BC, since <BDC=<BAC+<ABD, this tells you <ABD=x as well.
Therefore, AD=BD, since we have already find out that BD=BC, so AD=BC. Statement 1 alone is sufficient.

Statement 2 tells you the value of X, but didn't tell you anything about the length of the segment, therefore is not sufficient.
Intern
Intern
avatar
Joined: 19 Oct 2010
Posts: 1
Followers: 0

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

Re: Gmat prep triangle lenght of side BC [#permalink] New post 23 Oct 2010, 14:12
Awesome 8-)
Just one simple explanation for how <BDC = <BAC+<ABD, exterior angle in a triangle is the sum of the opposite interior angles. It took me a while to figure it out, may be helpful.
Retired Moderator
User avatar
Status: 2000 posts! I don't know whether I should feel great or sad about it! LOL
Joined: 04 Oct 2009
Posts: 1726
Location: Peru
Schools: Harvard, Stanford, Wharton, MIT & HKS (Government)
WE 1: Economic research
WE 2: Banking
WE 3: Government: Foreign Trade and SMEs
Followers: 66

Kudos [?]: 301 [0], given: 109

GMAT Tests User
Re: Gmat prep triangle lenght of side BC [#permalink] New post 08 Nov 2010, 05:06
+1 A 8-)
_________________

"Life’s battle doesn’t always go to stronger or faster men; but sooner or later the man who wins is the one who thinks he can."

My Integrated Reasoning Logbook / Diary: my-ir-logbook-diary-133264.html

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Manager
Manager
User avatar
Status: Planning to retake.
Affiliations: Alpha Psi Omega
Joined: 25 Oct 2010
Posts: 90
Concentration: General Management, Entrepreneurship
GMAT 1: 650 Q42 V37
GRE 1: 1310 Q630 V680
GPA: 3.16
Followers: 1

Kudos [?]: 14 [0], given: 14

Re: Gmat prep triangle lenght of side BC [#permalink] New post 22 Nov 2010, 08:17
I was going to pick A originally, but upon seeing that x=36 (I assumed that x should be 30), I felt no choice but to pick C.

Why is it unnecessary to know what x is?
_________________

Did I help you? Please give me kudos.

Each moment of time ought to be put to proper use, either in business, in improving the mind, in the innocent and necessary relaxations and entertainments of life, or in the care of the moral and religious part of our nature.

-William Andrus Alcott

Intern
Intern
avatar
Joined: 17 Aug 2009
Posts: 41
Location: United States
Concentration: Finance, Entrepreneurship
GMAT 1: 740 Q49 V42
GPA: 3.29
WE: Engineering (Consulting)
Followers: 0

Kudos [?]: 11 [0], given: 4

Re: Gmat prep triangle lenght of side BC [#permalink] New post 22 Nov 2010, 12:15
rockzom wrote:
I was going to pick A originally, but upon seeing that x=36 (I assumed that x should be 30), I felt no choice but to pick C.

Why is it unnecessary to know what x is?


Regardless of the actual value of x, we can show that triangle ADB is an isosceles triangle.

Within the bounds of the givens in this problem, changing x will only lead to changes in the length of side AB and DC.
Manager
Manager
User avatar
Joined: 01 Nov 2010
Posts: 183
Location: Zürich, Switzerland
Followers: 2

Kudos [?]: 15 [0], given: 20

Re: Gmat prep triangle lenght of side BC [#permalink] New post 22 Nov 2010, 12:36
(180 -2x) + x + ABD = 180

therefore x= abd

So, AB=BD=BC=6; Answer A is sufficient.

B is not sufficient since merely knowing angles does not reach upon length of AB.


Answer:- A
Re: Gmat prep triangle lenght of side BC   [#permalink] 22 Nov 2010, 12:36
    Similar topics Author Replies Last post
Similar
Topics:
2 Experts publish their posts in the topic In triangle ABC above, what is the length of side BC? Bunuel 7 03 Mar 2014, 23:20
17 Experts publish their posts in the topic In triangle ABC above, what is the length of side BC? anilnandyala 13 21 Dec 2010, 07:17
In triangle ABC below, what is the length of side BC? 1, pinal2 4 01 Nov 2007, 09:40
In Triangle ABC, what is the length of side BC? 1) Line asaf 6 12 Jul 2007, 18:33
In triangle ABC above, what is the length of side BC? 1) netcaesar 4 14 Nov 2006, 11:10
Display posts from previous: Sort by

In triangle ABC above, what is the lenght of side BC? 1)

  Question banks Downloads My Bookmarks Reviews Important topics  


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®.