Dimensioning curved objects
The important point in dimensioning a curve is that the builder must be able to replicate the curve from a drawing to the site. To do this, three components should be included: actual curvature, location of center point of the curve, and extent of the curve. The actual curvature is denoted as radius of the curve, which emanates from the center point for the curve. The center point of the curve should be also dimensioned by locating it along x and y axis to anchor the point. The extent of the curve which may be only part of a full circle or half circle should be measured by giving location information on the each end of the curve related to other objects on the drawing.
Figure31 Dimensioning a curve