CIRCLES

Circle: It is a closed curve line made by points and it has a center.
Circunference: Is the line outside of a circle.
Center: It is the point equidistant to any of the points on circe.
Radius: Is the line from the center of the circle to any point.
Diameter: Is the line that passes through the center from any point on the circunference to another.
Chord: Is a line that passes through a point of the circnference to an other, but it doesn't touch the center.
Arc: It a part of the line of the circunference