Areal radius
= Areal radius
{title2=$r$}
In a spherically symmetric <spacetime>, the <areal radius> $r$ is defined by the area $A=4\pi r^2$ of each symmetry sphere. It is independent of which radial coordinate chart is used.
= Areal radius
{title2=$r$}
In a spherically symmetric <spacetime>, the <areal radius> $r$ is defined by the area $A=4\pi r^2$ of each symmetry sphere. It is independent of which radial coordinate chart is used.