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 Related Terms
 Circumference:  The distance around a circle.
Perimeter: The sum of the lengths of the sides of a polygon.
Area of a Circle: The measurement of the region enclosed by a circle. The area of a circle is always expressed in squared units.
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.
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.