It's the radius of a circle or sphere WITH A SHELL(or Thickness); like if an Lid on a jar had a diameter of 11mm across on the outside (top of lid); and was ONE mm thick,
then the inside radius would be 5. ie; 11mm outer diameter, minus (-) 1mm thickness (aka; or shell) equals (=) 10mm (inner) diameter; which is a 5mm radius.
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== A radius is half of diameter,the formula of radius== d/2 ===
Radius times two (r x r)
The radius is any point on the surface of the circle to the center of the circle.
The radius is the distance between the centre of a circular arc and a point on the arc.
radius