 WAPCA                                                              Menu: MWALS
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 Creates a multi-layer wall arc given a starting point, center point and angle.

         1. (POINT) starting point of arc
         2. (POINT) center of arc (press <ENTER> for a NEW start pt.)
         3. (NUM) arc angle (+/- 0.1-360 deg.)
         4. (Y/N) y-defined point relates to concave arc surface, n-convex <y>

 Description:
 This command allows you to create a multi-layer wall arc by defining
 a starting point, center point and angle. The arc will start at the first
 point, and go around the center point for the specified angle in
 a counterclockwise direction. This arc may be a free arc only, i.e., it cannot
 be created within an existing wall.
 Specify two points (starting and center). Specify the angle. State whether the
 defined points are to be on the concave or convex surface of the arc.
