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The distance from the center of a Circle to its Perimeter, or from the center of a Sphere to its surface. The radius is equal to half the Diameter.
See also Bertrand's Problem, Circle, Circumference, Diameter, Extent, Inversion Radius, Kinney's Set, Pi, Radius of Convergence, Radius of Curvature, Radius (Graph), Radius of Gyration, Radius of Torsion, Radius Vector, Sphere