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In some cases, a polygon feature may contain holes and it is necessary to calculate the area of the holes. However, the hole features do not contain any data. These instructions describe how to measure the area of donut holes of a polygon feature.
Note: All feature classes typically have a field named Shape_Area, which displays the area of the feature. If the Shape_Area field is not available in the attribute table, create a new field with the type Double, and calculate the area of the hole by using Calculate Geometry. For more information on how to use Calculate Geometry, refer to the following documentation: Calculating area, length, and other geometric properties.