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If a circle with center at the origin passes through the poi

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If a circle with center at the origin passes through the poi [#permalink] New post 15 Apr 2005, 07:33
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If a circle with center at the origin passes through the point ( 0,5)
through which of the following points does it also pass?

A) 2, sqrt 21

B) 4,5

C) 5, sqrt 21

D) ( 5, 5)

E) ( 5, 12)
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 [#permalink] New post 15 Apr 2005, 07:39
"A"

eqn of the circle.....x^2 + y^2 = 25...where the center is (0,0) and radius is 5

only A satisfies the above eqn for X,Y.
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 [#permalink] New post 15 Apr 2005, 07:47
Thanks banerjeea_98 you have the correct answer.

My math is a little rusty the eqn of the circle is X^2 + Y^2 = R^2 (R = Radius)

Is this the standard eqn of the circle irrespective if the center is origin (0, 0) or center is on any other quadrant e.g (2, 3) OR (-4,-6) The eqn is still the same, right ? Please clarify.
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 [#permalink] New post 15 Apr 2005, 07:55
TS wrote:
Thanks banerjeea_98 you have the correct answer.

My math is a little rusty the eqn of the circle is X^2 + Y^2 = R^2 (R = Radius)

Is this the standard eqn of the circle irrespective if the center is origin (0, 0) or center is on any other quadrant e.g (2, 3) OR (-4,-6) The eqn is still the same, right ? Please clarify.


no generic eqn is (x-a)^2 + (y-b)^2 = r^2.....where r = radius and (a,b) is the center.
  [#permalink] 15 Apr 2005, 07:55
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