When lines in a personal geodatabase feature class are converted to a polygon feature class using the 'Feature to Polygon Tool' in ArcToolBox > Data Management Tools > Features, the Shape_Area for some polygons is negative.
If the lines were digitized in a clockwise direction, the polygons created from those lines have a negative value in the Shape_Area field.
This issue also occurs with both CAD and KML data imported to the geodatabase. The Repair Geometry Tool also solves the problem for line features imported under these circumstances.
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