radius meaning____________
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In classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length. The name comes from the Latin radius, meaning ray but also the spoke of a chariot wheel.
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a line segment extending from the center of a circle or sphere to the circumference or bounding surface. 2a : the bone on the thumb side of the human forearm also : a corresponding part of vertebrates above fishes. b : the third and usually largest vein of an insect's wing.
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