BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

point on a circle

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Master | Next Rank: 500 Posts
Posts: 208
Joined: Sun Sep 28, 2008 12:30 pm
Thanked: 22 times

point on a circle

by neoreaves » Fri Apr 16, 2010 5:40 am
IN THE XY-PLANE, POINT (R,S) LIES ON THE CIRCLE WITH CENTER AT ORIGIN. WHAT IS THE VALUE OF R^2 + S^2?

I. THE CIRCLE HAS RADIUS 2
II. THE POINT (a, -a) LIES ON THE CIRCLE
Last edited by neoreaves on Fri Apr 16, 2010 6:30 am, edited 1 time in total.
Top
Source: — Data Sufficiency |
Legendary Member
Posts: 576
Joined: Sat Mar 13, 2010 8:31 pm
Thanked: 97 times
Followed by:1 members

by liferocks » Fri Apr 16, 2010 5:50 am
neoreaves wrote:IN THE XY-PLANE, POINT (R,S) LIES ON THE CIRCLE WITH CENTER AT ORIGIN. WHAT IS THE VALUE OF R^2 + S^2?

I. THE CIRCLE HAS RADIUS 2
II. THE POINT (V2, -V2) LIES ON THE CIRCLE
IMO ans is D

since the center of the circle is origin the distance of point (R,S) from center will be sqroot(R^2+S^2) and (R,S) lies of the circle so this brings down the question to the fact that what is the radius of the circle as that is equal to sqroot(R^2+S^2) or
R^2+S^2=square of radius

now statement 1 provides the radius directly-->Suff
Statement 2 provides another point on circle.so square of radius will be radius will be 2+2=4-->suff

hence either of the statements is sufficient to ans
Top
User avatar
Master | Next Rank: 500 Posts
Posts: 208
Joined: Sun Sep 28, 2008 12:30 pm
Thanked: 22 times

by neoreaves » Fri Apr 16, 2010 6:30 am
ok i see what you are saying let me edit the question ....instead of sqrt2 lets put in a
Top
Legendary Member
Posts: 576
Joined: Sat Mar 13, 2010 8:31 pm
Thanked: 97 times
Followed by:1 members

by liferocks » Fri Apr 16, 2010 6:35 am
neoreaves wrote:ok i see what you are saying let me edit the question ....instead of sqrt2 lets put in a
hmm..in this case option 2 gives that the radius is (V2)a.we do not know what is a hence this should be insuff.
then only 1 is suff .So ans will be A
is the approach correct?
Top
User avatar
Master | Next Rank: 500 Posts
Posts: 435
Joined: Mon Mar 15, 2010 6:15 am
Thanked: 32 times
Followed by:1 members

by eaakbari » Fri Apr 16, 2010 11:37 am
IMO A
Whether you think you can or can't, you're right.
- Henry Ford
Top
Senior | Next Rank: 100 Posts
Posts: 43
Joined: Sun Mar 21, 2010 4:32 am
Thanked: 1 times

by deepesh.gupta » Sat Apr 17, 2010 8:47 am
I am confused between A and D. Can we have experts views?


liferocks wrote:
neoreaves wrote:ok i see what you are saying let me edit the question ....instead of sqrt2 lets put in a
hmm..in this case option 2 gives that the radius is (V2)a.we do not know what is a hence this should be insuff.
then only 1 is suff .So ans will be A
is the approach correct?
Top
Post new topic Post Reply
• Page 1 of 1