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If A and B are different points on graph x^2 + y^2 = 25 then what is

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If A and B are different points on graph x^2 + y^2 = 25 then what is [#permalink]

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If A and B are different points on graph x^2 + y^2 = 25 then what is the length of line AB?

1) The Y co-ordinates of both A and B points are identical
2) X and Y co-ordinates of both points A and B are integers

Source: www.GMATinsight.com
[Reveal] Spoiler: OA

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Re: If A and B are different points on graph x^2 + y^2 = 25 then what is [#permalink]

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New post 12 Oct 2017, 13:33
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GMATinsight wrote:
If A and B are different points on graph x^2 + y^2 = 25 then what is the length of line AB?

1) The Y co-ordinates of both A and B points are identical
2) X and Y co-ordinates of both points A and B are integers

Source: http://www.GMATinsight.com


The above equation represents a circle with radius 5 and center (0,0)

1) The Y co-ordinates of both A and B points are identical

Case 1: Let A = (5,0) & B = (-5,0)..........AB is the diameter of the circle =10

Case 2: Let A = (3,4) & B = (-3,4)..........AB is less than length of the diameter.

Insufficient

2) X and Y co-ordinates of both points A and B are integers

Case 1: Let A = (5,0) & B = (-5,0)..........AB is the diameter of the circle =10

Case 2: Let A = (3,4) & B = (-3,4)..........AB is less than length of the diameter.

Insufficient

Combine 1 & 2 using same examples above, no certain length of AB

Insufficient

Answer: E

Kudos [?]: 322 [1], given: 170

Re: If A and B are different points on graph x^2 + y^2 = 25 then what is   [#permalink] 12 Oct 2017, 13:33
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