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Caption=1. Find a centre of the given circle.~~2. Choose "Locus properties/Create locus"~~    for the obtained circle's centre and, ~~    changing the radius R of the circle, draw~~    a required geometrical locus.~~3. Conclude what a required locus is.~~4. Solve this problem for different position~~    of points À ànd Â in the plane.~~5. Prove the obtained result.
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