yes it is .
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Yes. The circles can be of different size. These are called concentric circles.
A cylinder has two circles as its bases.
concentric circles
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.
Well, in math you solve the perimeter of circles and such, and learn understanding of them to help you with circles in real life.