If you mean they both have the same centre - they're called 'concentric' circles.
They are Concentric circle, as they are sharing the same common centre
Concentric circles.
mandorla or vesica piscis (if they have the same radius)
Concentric circles
congruent circles
If two circles intersect then they have to intersect at two points.
Concentric circles
If the two circles are tangent to each other,then it must be at the same point.
Yes.
When the centers of both the circles are at the same point.
Concentric circles are the circles with the same center therefore they do not cross with each other as the "center is not considered a point on the circle". An exception would be two circles that are concentric and have the same radius, in which case the circles are indistinct and every point of the circles is an intersection.
Concentric circles.
Concentric circles.
concentric
mandorla or vesica piscis (if they have the same radius)
Tangent circles.
Concentric circles
congruent circles