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Manager
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geometry [#permalink] New post 21 Aug 2003, 09:47
so why is the answer A.

On the xy-coordinate plane, all of the following xy-coordinate points lie on the circumference of a circle whose radius is 10 and whose center lies at the (x,y) point (-1,0) EXCEPT:
(A) (тАУ6, тАУ7)
(B) (тАУ2, 3 sp. root 11)
(C) (тАУ1, тАУ10)
(D) (7, 6)
(E) (1, тАУ4sq. root of 6)

Thanks,

Rich
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 [#permalink] New post 21 Aug 2003, 10:13
Here you need to use the distance formula:

sq. root ((y2-y1)^2 + (x2-x1)^2)

we are looking for the ine choice that does not equal 10. All but A equal 10, so it must be A.
  [#permalink] 21 Aug 2003, 10:13
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