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English definition of “radius”

radius

noun [C]     /ˈreɪdiəs/ (plural radii)
POINT a certain distance from a particular point in any direction : Most facilities lie within a two-mile radius of the house .Measurements in general
CIRCLE the distance from the centre of a circle to its edge Properties of circles and curvesParts of geometrical shapes
(Definition of radius noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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