


Related Terms 


Pi: The ratio of the circumference of a circle to its diameter. 
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.
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.
Ratio: A comparison of two quantities that have the same unit of measure.
Circle: The set of all points in a plane that are the same distance, called the radius, from a given point, called the center.


