Wörterbuch (en): Radius
de: 
Radius (m)
fr: 
Radius (m) / Rayon (m) 
it: 
Raggio
es: 
Radio (m) 
The radius is the distance between the center M of a circle and the circumference. More generally, the distance between the center and the spherical surface is also called the radius for a three-dimensional sphere or sphere.
