GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 18 Oct 2019, 04:30

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.

Close

Request Expert Reply

Confirm Cancel

What is the area of the above circle?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Retired Moderator
User avatar
V
Joined: 27 Oct 2017
Posts: 1259
Location: India
Concentration: International Business, General Management
GPA: 3.64
WE: Business Development (Energy and Utilities)
What is the area of the above circle?  [#permalink]

Show Tags

New post 13 Oct 2018, 10:25
1
5
00:00
A
B
C
D
E

Difficulty:

  85% (hard)

Question Stats:

39% (02:17) correct 61% (02:06) wrong based on 40 sessions

HideShow timer Statistics

Attachment:
Q2.jpg
Q2.jpg [ 30.25 KiB | Viewed 509 times ]
What is the area of the above circle?
1) Angle ABC = 90 deg
B) CD = 12

Weekly Quant Quiz #4 Ques 6


_________________
Most Helpful Community Reply
Retired Moderator
User avatar
V
Joined: 27 Oct 2017
Posts: 1259
Location: India
Concentration: International Business, General Management
GPA: 3.64
WE: Business Development (Energy and Utilities)
Re: What is the area of the above circle?  [#permalink]

Show Tags

New post 13 Oct 2018, 21:09
2
This Question can be easily explained using one of the basic property:

A Unique Circle can be drawn using 3 non-collinear points.


As we need the radius of the circle, we need to find the relative position of points wrt each other.
Let us suppose that point C (0,0)
Statement 1: Points C (0,0), A(15,8), D(0,-k) where k is length of CD
Since all points are not defined , circle is not defined.
NOT SUFFICIENT
Statement 2: Points C (0,0), D(0,-12), point A not defined.
NOT SUFFICIENT

combining Statement 1& 2 , we get
Points are A(15,8) C(0,0) and D(0, -12), hence a unique circle can be drawn and its area can be calculated.
SUFFICIENT.
Answer C

(Since, It is a DS Question, there is no need to find the exact area, we need to know whether it can be determined uniquely or not)
_________________
General Discussion
Senior Manager
Senior Manager
avatar
P
Joined: 05 Jul 2018
Posts: 418
Location: India
Concentration: General Management, Technology
GMAT 1: 600 Q47 V26
GRE 1: Q162 V149
GPA: 3.6
WE: Information Technology (Consulting)
Reviews Badge CAT Tests
Re: What is the area of the above circle?  [#permalink]

Show Tags

New post 13 Oct 2018, 10:43
Extended CB will touch the circle on point E(let us assume). Now DE has to be the diameter of the Circle. To be able to find length of DE we must be able to find the length of BE first. Now let us see if Either of the statements help us in finding the length of BE(where E is the point where extended CB touches the other end of circle).

1)Angle ABC = 90 deg . This only gives the length of AC the hypotenuse of triangle ABC. Hence NOT SUFFICIENT
2) CD = 12 . This info does not help us in finding the length of BE. Hence this too is NOT SUFFICIENT

Hence, the answer must be E
_________________
RC Moderator
User avatar
V
Joined: 24 Aug 2016
Posts: 789
GMAT 1: 540 Q49 V16
GMAT 2: 680 Q49 V33
GMAT ToolKit User Premium Member Reviews Badge CAT Tests
Re: What is the area of the above circle?  [#permalink]

Show Tags

New post 13 Oct 2018, 11:04
1) Angle ABC = 90 deg.... NS .... we only get AC=17... not the radius or dia
2) CD = 12 .... NS .... we only get AD=25... not the radius or dia

Ans E
_________________
Please let me know if I am going in wrong direction.
Thanks in appreciation.
GMAT Club Bot
Re: What is the area of the above circle?   [#permalink] 13 Oct 2018, 11:04
Display posts from previous: Sort by

What is the area of the above circle?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne