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Deleting the hatch of your "original" geometry and giving the hatch command followed by a select window the following is output: Command: HATCH Select objects or [picK internal point/Undo/seTtings]:Specify opposite corner: 186 found Select objects or [picK internal point/Undo/seTtings]:The Boolean operation on solid and/or surface bodies failed. Modeling Operation Error: Error Code Number is 18030 The Boolean operation on solid and/or surface bodies failed. Modeling Operation Error: Error Code Number is 18030 A hatch is created with an area of 2102. Now delete this hatch and move the small polyline areas surrounding the some of the shapes (the only visible differences between the two object collections) as follows: Now applying a hatch to the geometry yield an area of 2464 for the hatch! Go figure. It appears that the area of a hatch gets confused when hatch areas are adjacent. A more foolproof way to compute areas for a collection of closed polylines is to: 1. Create regions from the polylines. 2. Union all the regions together. The area of the one unioned region will be the total area.