In the rectangular coordinate system, are the points (a, b) : DS Archive
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# In the rectangular coordinate system, are the points (a, b)

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In the rectangular coordinate system, are the points (a, b) [#permalink]

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17 Dec 2007, 13:57
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In the rectangular coordinate system, are the points (a, b) and (c, d) equidistant from the origin?

(1) a/b = c/d

(2) sqrt (a^2) + sqrt (b^2) = sqrt (c^2) + sqrt (d^2)
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17 Dec 2007, 14:10
http://www.gmatclub.com/forum/t56947

Fig gave good explanation.
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17 Dec 2007, 17:59
I get C.

S1: a/b=c/d could be 3/3=-3/-3 or 3/3=4/4

S2: Could be 2,2, -2,-2 or any combination.

Together, these are suff.
17 Dec 2007, 17:59
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