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In the XY plane , a circle with centre on origin has point

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In the XY plane , a circle with centre on origin has point [#permalink] New post 24 Nov 2008, 10:05
In the XY plane , a circle with centre on origin has point r,s on the circle.
What is the value of r^2 +s^2?

1) the radius is 2

2) the point V2, (-)V2 lies on the circle

Last edited by Nihit on 24 Nov 2008, 15:01, edited 2 times in total.
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Re: Circle [#permalink] New post 24 Nov 2008, 10:16
Nihit wrote:
In the XY plane , a circle with centre on origin has points r,s on the circle.
What is the value of r^2 +s^2?

1) the radius is 2

2) the point V2and (-)V2 lies on the circle

(r,s) is on the circle so r2+s2= radius2 (coz the circle has center on origin)

1) r2+s2= radius2 => enough
2) (√2, -√2) is on the circle means (√2)^2+(-√2)^2= Radius ^ 2= r2 +s2
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Re: Circle [#permalink] New post 24 Nov 2008, 12:40
D

Each statement gives us a radius, which is sufficient to get r^2+s^2
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Re: Circle [#permalink] New post 24 Nov 2008, 12:43
the question says
"points" r,s which to me means 2 different points r and s

hence E for me

btw what is 2 trying to say ???
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Re: Circle [#permalink] New post 24 Nov 2008, 13:46
Stallone good point . Seems like r , s not (r,s) ie not x,y

E for me
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Re: Circle [#permalink] New post 24 Nov 2008, 14:37
What was the OA? I took away that and r and s are two different points. Hence E
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Re: Circle [#permalink] New post 24 Nov 2008, 14:39
Sorry guys its point and not points !
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Re: Circle [#permalink] New post 24 Nov 2008, 18:46
stallone wrote:
the question says
"points" r,s which to me means 2 different points r and s

hence E for me

btw what is 2 trying to say ???


You can't square a point. We use capital letters to symbolize a point.
I think r,s means (r,s).
2 gives you a point which is already on the circle.
D for me.
Re: Circle   [#permalink] 24 Nov 2008, 18:46
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