CG_Area — Calculates the area of a geometry
double precision CG_Area(
                            geometry
                            geom
                        );
Calculates the area of a geometry.
Performed by the SFCGAL module
                 
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                 NOTE: this function returns a double precision value representing the area.  | 
            
Availability: 3.5.0
            
            This method needs SFCGAL backend.
        
SELECT CG_Area('Polygon ((0 0, 0 5, 5 5, 5 0, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1), (3 3, 4 3, 4 4, 3 4, 3 3))');
                cg_area
                --------
                25
                (1 row)