This routine from Juan Villarreal projects points and generates closed polylines in AutoCAD according to a user-defined area and number of areas. Start by loading the LISP file, then type in the command CA. You will be prompted to pick a first base point, a second base point, and a point on each adjacent side. The routine will then ask you for an area for each closed polyline, and suggest size and quantity limits based on the initial input. For example, if the adjacent sides are converging on each other, there is a limit to the number of closed areas that can be created. Juan's routine contains plenty of comments to help you see how it works.