Circle: set of points at the same distance to the center.
Circumference: the complete distance around the circle.
Center: is the middle point.
Radius: is the length from the center to its perimeter.
Diameter: its the length is double than the radius.
Chord: a line segment which connects two points of the circle not through the center.
Arc: segment of a circle.
Tangent: element which touch a circle in one point .
Outer: when an element doesn't touch a circle in one point.
Inner: when an element is inside the circumference.
Concentric circles: they are circles whit different radius.
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