2012

Quadrant
Snaps to a quadrant point of an arc, circle, ellipse, or elliptical arc.
Intersection
Snaps to the intersection of an arc, circle, ellipse, elliptical arc, line, polyline,
ray, region, spline, or xline. Extended Intersection is not available as a running
object snap.
Intersection and Extended Intersection do not work with edges or corners of
3D solids created in AutoCAD.
NOTE You might get varying results if you have both the Intersection and Apparent
Intersection running object snaps turned on at the same time.
Extension
Causes a temporary extension line or arc to be displayed when you pass the
cursor over the endpoint of objects, so you can specify points on the extension.
NOTE When working in perspective view, you cannot track along the extension
line of an arc or elliptical arc.
Insertion
422 | Chapter 5 D Commands