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05 Aug 2007, 15:23
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In the xy plane, point (r,s) lies on the circle with center at the origin. What is the value of r^2 + s^2
1. The circle has radius 2
2. The point (v2, -v2) lies on the circle.
1. The circle has radius 2
2. The point (v2, -v2) lies on the circle.
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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
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05 Aug 2007, 18:26
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The answer is A
Since statement 1 tells you the center of the circle is the origin and the radius is 2, you know from the Pytheagiam theorum ( don't pay too much attention to my spelling) that r^2+s^2=2^2; therefore sufficient.
Statement 2 tells you nothing about r and s therefore insufficient.
Since statement 1 tells you the center of the circle is the origin and the radius is 2, you know from the Pytheagiam theorum ( don't pay too much attention to my spelling) that r^2+s^2=2^2; therefore sufficient.
Statement 2 tells you nothing about r and s therefore insufficient.
05 Aug 2007, 21:21
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eileen1017
Draw a diagram with circle at center (0,0)... any point on the circle would correspond to the radius...therefore sqrt(x^2 + y^2 = r^2) for any point (x,y) on the circle...
The first provides the value of the radius..therefore it is sufficient!
FP
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
