RADIUS lets you dimension the radius of an arc or circle.

Choose an option for dimensioning the radius:

REGULAR - lets you dimension the radius of a circle or arc
          that you created in the same view as the one in 
          which you are dimensioning.

EDGE    - lets you dimension an arc or circle that you
          created in a view that is different than the one
          in which you are dimensioning.
 
BENT    - lets you dimension an arc or circle whose center
          does not appear on-screen.
