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Caption=Circles with centres Î and Î1 intersect~~at points À and Â. What is the mutual ~~position of lines ÀÂ and ÎÎ1?
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Caption=1. Moving the point Î or Î1 (that is~~    changing location of the line ÎÎ1 ~~    in the plane), explore the mutual ~~    position of the lines ÀÂ ànd ÎÎ1.~~2. Conclude and prove the obtained result.
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Message=Explore a value of the angle ADO (îr ADO1).
