IMPORTANT DEFINITIONS ABOUT CIRCLES
Circle: Set of points at the same distance (equidistant) to a point called center.
Circumference: It is the full lenght of a circle. The complete distance arund a circle.
Centre: It is the point equidistant to any of the points on a circle.
Radius: It is the lenght of a line segment from the center to its perimeter. (PluralRadii from latin or common english radiuses).
Diameter: A line segment that passes through the center and conects two points of a circle. Its lengh is double than the radius.
Chord: A line segment which conects two points of the circle not through the center.
Arc: Segment of a circle.
Tangent: Element ( straight or curve lines) which touch a circle in one point.
Outer: When an element (line or curve) doesn't touch the circumference, or another element.
Inner: When an element (line or curve) is ditted inside the circumference, or another element, being tangent or not.
Concentric circles: They are circles with diferent radius but place in the plane sharing the center.
EXAMPLE:
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