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CIRCLE A circle is the set of all points in a plane that are a fixed distance from a point called the center of the circle.
RADIUS A radius of a circle is a line segment joining the center of the circle to one of the points on the circle.
DIAMETER A diameter of a circle is a line segment that contains the center of the circle and has its endpoints on the circle.
TANGENT A tangent to a circle is a line that intersects the circle in exactly one point. The point is called the point of the tangent.
CHORD A chord is a line segment with endpoints on the circle.
ARC An arc of a circle is an unbroken portion of the circle.
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