Autodesk AUTOCAD 2006, Command Reference Manual, Page: 227 / 1490

Obtain a Radius
The rad function determines the radius of a selected object.
rad
Determines the radius of a selected object. The object can be a circle, an
arc, or a 2D polyline arc segment.
The following example uses rad with the CIRCLE command. The radius of
the new circle is two-thirds of the radius of the selected polyline arc segment:
Command: circle
Specify center point for circle or [3P/2P/Ttr (tangent tangent radius)]: cen
of Select the circle
Specify radius of circle or [Diameter] <last>: 'cal
>> Expression: 2/3*rad
>> Select circle, arc or polyline segment for RAD function: Select the circle
arc
new circle
center
Obtain an Angle
The ang function determines the angle between two lines. Angles are measured
counterclockwise with respect to either the X axis, in the two-dimensional
case, or to a user-specified axis, in the three-dimensional case.
ang(apex,p1,p2)
Determines the angle between lines (apex,p1) and (apex,p2). The points are
considered 2D, projected on the XY plane of the current UCS.
ang(apex,p1,p2,p)
Determines the angle between lines (apex,p1) and (apex,p2). The lines are
considered 3D. The last parameter, point p, is used to define the orientation
of the angle. The angle is measured counterclockwise with respect to the
axis going from apex to p.
Obtain a Radius | 203