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Two gears turning each other .
Tangent circles are circles that touch one another without crossing. The distance between the centres of the circles must be equal to the difference or the sum of their radii.
No, tangent circles do not have the same center. They just touch at the side. Here is an example:
If the two circles are tangent to each other,then it must be at the same point.
No; tangent circles touch each other at one point but concentric circles cannot not touch.