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 Related Terms
 Radius:  The distance from the center of a circle to any point on the circle. Also, the line segment that has the center of the circle as one endpoint and a point on the circle as the other endpoint.
Distance: The amount of space between two points or things. Distance is always a non-negative number.
Line Segment: The part of a line between two points on the line. Sometimes referred to as a segment.
Endpoint: The point at an end of a line segment.
Circle: The set of all points in a plane that are the same distance, called the radius, from a given point, called the center.
Center of a Circle: The point inside the circle that is the same distance from all of the points on the circle.
Area of a Circle: The measurement of the region enclosed by a circle. The area of a circle is always expressed in squared units.
Circumference: The distance around a circle.
Diameter: The distance across a circle through its center. The line segment that includes the center and whose endpoints lie on the circle.
Pi: The ratio of the circumference of a circle to its diameter.