For an ArcGIS project opened in ArcMap 10, we have added polygon layers representing different geographical features.
After all the polygons were created, we opened the attribute tables for those layers, and to our shock/dismay, the cells in the "shape_area" column all showed zero! (The "shape_length" field was correctly filled.) We also tried the Measure tool in the toolbar, but it could only measure distances, and the Area button was greyed out.
We checked to make sure that all layers were in the correct geographical coordinate system (WGS 1984).
What did we do wrong? Is there any way to obtain the areas of the polygons we created?
As Brad suggested, I tried to right click on the "SHAPE_Area" column (both on the column label and in the column), but the "Calculate geometry" (and "Field calculator") options were also greyed out.