Circles: Set of points of the same distance (equidistant) to a
point called centre.
Circunference: it is the full lengh of a circle. The complete
distance around a circle.
Center: it
is the point equidistant to any of the points on a circles.
Radius: it
is the lengh of a line segment from the centre to perimetre.
Diameter: a line segment that passes though the center and
conects two points of a circle.
Chord: a
line segment which never intersect them selves so all points are equidistant.
Arc: line
segment of a circle.
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