Radius

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The radius of a circle
The radius of a circle

In geometry, the radius of a circle or sphere is the shortest connection between the center and the boundary. It is half of the diameter.

The relationship between the radius {\displaystyle r} and the circumference {\displaystyle c} of a circle is ~c = 2\pi r.

The area {\displaystyle A} of a circle of radius {\displaystyle r} is {\displaystyle ~A = \pi r^2.}

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