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What is a radius?

What is a radius? Here are some definitions.

Noun
  1. (anatomy) The long bone in the forearm, on the side of the thumb.
  2. (zoology) The lighter bone (or fused portion of bone) in the forelimb of an animal.
  3. (entomology) One of the major veins of the insect wing, between the subcosta and the media
  4. (geometry) A line segment between any point of a circle or sphere and its center.
  5. (geometry) The length of this line segment.
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Thus, the area of a circle is equal to half of the product of the radius and the circumference.
Maybe it was the guy in the car next to you blasting acid rock music to everyone within a 20 block radius.
Note that this curvature is the inverse of the radius of a circle tangent to the neutral line at this point.
He calculates the side of a regular pentagon in terms of the radius of the circumscribed circle.
As a brattish youngster, I remember the unfeasible joy gained from making every payphone in a five-mile radius ring simultaneously.
Hookers, johns, drunks, drug dealers and police are familiar sights in this area, which has seven schools within a two-block radius.

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