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 Related Terms
 Center of a Circle:  The point inside the circle that is the same distance from all of the points on the circle.
Distance: The amount of space between two points or things. Distance is always a non-negative number.
Point: One of the basic undefined terms of geometry. A point has no length, width, or thickness, and we often use a dot to represent it.
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.
Circle: The set of all points in a plane that are the same distance, called the radius, from a given point, called the center.