Question 1176685
Two circles have the same center. One circle has a diameter of 3 centimeters and the other has a diameter of 1 centimeters. 
What is the locus of points equidistant from the two circles? What is the description?
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To answer this question correctly, you should know that the distance from a point to a curve is 
the MINIMAL distance from the point to the curve.


Keeping it in your mind, you conclude that the locus of the points under the problem's question is the circle of the radius 2 centimeters
centered at the same center.