The Sliding Area command will report the area of a closed polygon and allow you to set it to a new size by sliding the selected side parallel to its orientation.
Options
-Select polyline side to slide
Graphically select the side of the polygon that will undergo a slide.-Keep existing pline Yes/<No>?
Indicate whether or not to keep the source polyline.- [Area reported] Indicate a desired size for the polygon and press Enter.
Note: Area values other than the primary Job Units can be supplied as discussed in Input Box Controls.