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See also: Drawing Radial Dimensions
The Radial (Dimension menu) command displays the radius of an arc. The dimension text can be preceded by the radius symbol, R or the diameter symbol, Ø.
Two digitises are required. The first, an entity digitise on the arc, determines the position of the arrow head on the arc. The second, a free digitise, determines whether the dimension text and arrow are inside the arc, or across the arc and extending beyond it to the text outside.