It is currently 21 Sep 2017, 09:21

Happening Now:

Live Chat with Amy Mitson, Sr. Associate Director of Admissions at Tuck Dartmouth


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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

In the xy-plane, point (r, s) lies on a circle with center

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
1 KUDOS received
Manager
Manager
avatar
B
Joined: 14 Jan 2006
Posts: 97

Kudos [?]: 37 [1], given: 2

Schools: HKUST
In the xy-plane, point (r, s) lies on a circle with center [#permalink]

Show Tags

New post 23 Sep 2008, 13:56
1
This post received
KUDOS
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

In the xy-plane, point (r, s) lies on a circle with center at the origin. What is the value of
r2 + s2?
(1) The circle has radius 2.
(2) The point (v2, -v2) lies on the circle.

Kudos [?]: 37 [1], given: 2

Senior Manager
Senior Manager
avatar
Joined: 31 Jul 2008
Posts: 294

Kudos [?]: 54 [0], given: 0

Re: GMAT SET 19 - 3 [#permalink]

Show Tags

New post 23 Sep 2008, 14:39
was there a figure with one ?

coz whats v2 ??

to mee A

Kudos [?]: 54 [0], given: 0

Director
Director
avatar
Joined: 23 May 2008
Posts: 803

Kudos [?]: 82 [0], given: 0

Re: GMAT SET 19 - 3 [#permalink]

Show Tags

New post 23 Sep 2008, 15:41
do you mean r^2 + s^2 ? if so I think A

Kudos [?]: 82 [0], given: 0

Expert Post
GMAT Tutor
avatar
B
Joined: 24 Jun 2008
Posts: 1341

Kudos [?]: 1910 [0], given: 6

Re: GMAT SET 19 - 3 [#permalink]

Show Tags

New post 23 Sep 2008, 16:13
Yes, I'm sure the question is asking for r^2 + s^2. If the circle has centre at the origin, then for every point (r, s) on the circle, r^2 + s^2 = radius^2; that just comes from Pythagoras. Each statement gives you the radius, so the answer should be D.
_________________

GMAT Tutor in Toronto

If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com

Kudos [?]: 1910 [0], given: 6

VP
VP
User avatar
Joined: 05 Jul 2008
Posts: 1403

Kudos [?]: 423 [0], given: 1

Re: GMAT SET 19 - 3 [#permalink]

Show Tags

New post 23 Sep 2008, 17:39
IanStewart wrote:
Yes, I'm sure the question is asking for r^2 + s^2. If the circle has centre at the origin, then for every point (r, s) on the circle, r^2 + s^2 = radius^2; that just comes from Pythagoras. Each statement gives you the radius, so the answer should be D.



How did the second statement ( v2, v-2 ) give us the radius?

Kudos [?]: 423 [0], given: 1

Expert Post
GMAT Tutor
avatar
B
Joined: 24 Jun 2008
Posts: 1341

Kudos [?]: 1910 [0], given: 6

Re: GMAT SET 19 - 3 [#permalink]

Show Tags

New post 24 Sep 2008, 10:10
icandy wrote:
IanStewart wrote:
Yes, I'm sure the question is asking for r^2 + s^2. If the circle has centre at the origin, then for every point (r, s) on the circle, r^2 + s^2 = radius^2; that just comes from Pythagoras. Each statement gives you the radius, so the answer should be D.



How did the second statement ( v2, v-2 ) give us the radius?


You have the co-ordinates of both a point on the circle and the centre of the circle. The distance between them is the radius... I should add that I'm interpreting the notation "( v2, -v2 )" to mean:

\(( \sqrt{2}, - \sqrt{2})\)

which I'm guessing is what is intended. If the 'v' is actually some kind of variable here, then of course we don't have the co-ordinates of a point.
_________________

GMAT Tutor in Toronto

If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com

Kudos [?]: 1910 [0], given: 6

Re: GMAT SET 19 - 3   [#permalink] 24 Sep 2008, 10:10
Display posts from previous: Sort by

In the xy-plane, point (r, s) lies on a circle with center

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


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

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

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®.