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 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.

Circles at Math.com: Practice naming parts of circles.

Mrs. Glosser's Math Goodies--Circumference: Read more about circles and practice calculating circumference.

Circumference Computation at aaamath.com: Practice calculating circumference.

Mrs. Glosser's Math Goodies--Circle Area: Read more about circles and practice calculating area.