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I'm sorry if what I'm asking has already been answered or is really easy but I struggled a little and haven't been able to come up with an idea.

TThe context is as follows: a robot is being placed inside a circle. I need to find the position the robot is being placed given that I know the center and the radius of the circle and that I have a distance sensor which gives me the distance to a point on the circle circumference.

I believe there isn't enough information to calculate this point. If that is indeed the case could you please point me to the kind of information i'm missing?.

Thank you in advance.

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    If the circle has radius $r$ and the robot measures distance $d to the circumference, then all you can say is that the robot is on the circle of radius $r-d$ around the center.2012-10-21
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    @Hagen: It says "distance to a point on the circumference", not "distance to the circumference". It's not clear in the question whether this is the distance to a fixed point, or to the nearest point, or to an arbitrary point, and if arbitrary, whether the sensor can be used more than once.2012-10-21
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    the distance is to an arbitrary point that gets picked by the senzor2012-10-22

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