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In a venn diagram there is one circle for a group, another circle for a different group, and where they overlap is things that belong to both groups. Some include the space outside the circles where there are items that don't belong in any group.
Tangential 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.
If 5 circles are inside the one circle, then the periphery is of the one circle. The periphery depends on the diameter of the one circle. The number of circles inside won't make any difference.
Yes, circles that share one and only one point are tangent to each other.