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Re: rectangular coordinate system [#permalink]
16 Jul 2008, 04:17

selvae wrote:

Answer D

if they are equi distance

then r^2 + s^2 = u^2+v2

1) r+s=1 == INSUFF

2) u=1-r v=1-s substitue in above equation you will get r+s = 1

so combing with 1, we can say both are equi distance

Hello what i don't understand is how you say r^2+s^2=u^2+v^2. I know we have r+s=1 => r^2+s^2=1-2*s*r and u+v=1 => u^2+v^2=1-2*u*v Since you conclude r^2+s^2=u^2+v^2 you must have concluded that r*s=u*v which i'm not sure about even when you combine the two assumptions!! I get E for this question.