2011

Table Of Contents
Quick Reference
Commands
RAY
Creates a line that starts at a point and continues to infinity.
XLINE
Creates a line of infinite length.
Create and Combine Areas (Regions)
Regions are two-dimensional enclosed areas that have physical properties such
as centroids or centers of mass. You can combine existing regions into a single,
complex region to calculate area.
You can create regions from objects that form closed loops. Loops can be
combinations of lines, polylines, circles, arcs, ellipses, elliptical arcs, and splines
that enclose an area.
Regions can be used for
Applying hatching and shading
Analyzing properties, such as area, using MASSPROP
Extracting design information, such as the centroid
You can create regions out of multiple loops and out of open curves whose
endpoints are connected and form loops. You cannot form regions from open
objects that intersect to form a closed area: for example, intersecting arcs or
self-intersecting curves.
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