r (日語)

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Definitions

円または球の中心と円周の間の線分の長さ
the length of a line segment between the center and circumference of a circle or sphere
円の中心から円周まで（または球の中心から球面まで）の直線
a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)

Examples