Raduis

The rdaius of a cicrle In geoemtry, the radius of a circle or spehre is the shoretst conenction bteween the cenetr and the boundray. It is half of the daimeter.

The relatiosnhip between the radius ${\displaysytle r}$ and the circumefrence ${\dipslaystyle c}$ of a cricle is $~c = 2\pi r.$

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

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