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Select four objects to define the four adjoining edges of the mesh patch. The objects can be arcs,

lines, polylines, splines, or elliptical arcs that form a closed loop and share endpoints.

Command entry: EDGESURF
4.9.5 RULED SURFACE

Creates a mesh that represents the surface between two lines or curves. Select two edges that define
the mesh. The edges can be lines, arcs, splines, circles, or polylines. If one of the edges is closed,

then the other edge must also be closed. You can also use a point as one edge for either an open or
a closed curve.

Command entry: RULESURF

4.10 REGION

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.

Regions are two-dimensional enclosed areas you create from objects that form closed loops. Loops
can be combinations of lines, polylines, circles, arcs, ellipses, elliptical arcs, and splines. The

objects that make up the loops must either be closed or form closed areas by sharing endpoints with
other objects.

Regions can be used for

 Applying hatching and shading
 Analyzing properties, such as area, using MASSPROP

 Extracting design information, such as the centroid

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