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Radius

Concept

Radius

A radius of a circle is a segment whose endpoints are the center of the circle and a point on the circle. By definition of circle, all radii are congruent.

On the other hand, the phrase the radius of a circle refers to the distance between the center of the circle and any point on it. It is usually represented by the variable r.r.
Furthermore, the radius of a circle is exactly half the length of the circle's diameter.

r=d2r = \dfrac{d}{2}