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# If a circle with center at the origin passes through the

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Eternal Intern
Joined: 07 Jun 2003
Posts: 467
Location: Lone Star State
If a circle with center at the origin passes through the [#permalink]

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30 Jul 2003, 12:25
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If a circle with center at the origin passes through the point ( 0,5)
through which of the following points does it also pass?

How do we know we have to use the distance formula?
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Ride em cowboy

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Joined: 10 Jun 2003
Posts: 210
Location: Maryland

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30 Jul 2003, 12:36
Every point along the circle will be of distance 5 from the origin. Unless there are choices like 5,0 0,-5 -5,0 (which would be too obvious) you will need to apply the distance formula. Even easier, since the center is at the origin, just draw some right triangles and apply the pythagorean theorem, where the hypoteneuse will be the distance from the origin to that point....do you care to provide the answer choices???
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