It is still called a circle.
concentric circles
Close - they're called concentric circles.
Concentric circles.
concentric circles
Concentric circles.
Yes, it is. Circles that are in the same plane and having the same center are called congruent circles.
Concentric Circle
Yes. The circles can be of different size. These are called concentric circles.
Circles in the same plane with the same center are concentric circles.
That line is called diameter. It divides a circle into two semi circles.
concentric circles
Semi-circles