Radius
From AoPSWiki
This article is a stub. Help us out by expanding it.
The radius of a circle is the distance from the center to any point on the circle. Identical definitions hold for the sphere and hypersphere.
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This article is a stub. Help us out by expanding it.
The radius of a circle is the distance from the center to any point on the circle. Identical definitions hold for the sphere and hypersphere.

