Definition:Radius
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Radius may refer to:
- Radius of a Circle: a straight line segment whose endpoints are the center and the circumference of the circle.
- Radius of an $\epsilon$-Ball: In the open $\epsilon$-ball neighborhood $N_\epsilon \left({x}\right)$ of the point $x$, the value $\epsilon$ is its radius.
- Radius of Convergence: The distance from the endpoints to the midpoint of the interval on which a power series is convergent.
