# Polygon Properties

- [CENTROID](https://mariadb.com/docs/server/reference/sql-statements/geometry-constructors/polygon-properties/centroid.md): Synonym for ST\_CENTROID. Returns the mathematical centroid of the Polygon or MultiPolygon as a Point geometry.
- [AREA](https://mariadb.com/docs/server/reference/sql-statements/geometry-constructors/polygon-properties/polygon-properties-area.md): Synonym for ST\_AREA. Returns the double-precision area of the Polygon or MultiPolygon, calculated in its spatial reference system.
- [ExteriorRing](https://mariadb.com/docs/server/reference/sql-statements/geometry-constructors/polygon-properties/polygon-properties-exteriorring.md): Synonym for ST\_ExteriorRing. Returns the exterior ring of a Polygon as a LineString.
- [InteriorRingN](https://mariadb.com/docs/server/reference/sql-statements/geometry-constructors/polygon-properties/polygon-properties-interiorringn.md): Synonym for ST\_InteriorRingN. Returns the N-th interior ring of a Polygon as a LineString.
- [NumInteriorRings](https://mariadb.com/docs/server/reference/sql-statements/geometry-constructors/polygon-properties/polygon-properties-numinteriorrings.md): Synonym for ST\_NumInteriorRings. Returns the number of interior rings in a Polygon geometry.
- [ST\_AREA](https://mariadb.com/docs/server/reference/sql-statements/geometry-constructors/polygon-properties/st_area.md): Returns the area of a Polygon or MultiPolygon. The result is a double-precision number measured in the geometry's spatial reference units.
- [ST\_CENTROID](https://mariadb.com/docs/server/reference/sql-statements/geometry-constructors/polygon-properties/st_centroid.md): Returns the centroid of a Polygon or MultiPolygon. The result is a Point geometry representing the mathematical center of mass.
- [ST\_ExteriorRing](https://mariadb.com/docs/server/reference/sql-statements/geometry-constructors/polygon-properties/st_exteriorring.md): Returns the exterior ring of a Polygon. This function extracts the outer boundary of the polygon as a LineString geometry.
- [ST\_InteriorRingN](https://mariadb.com/docs/server/reference/sql-statements/geometry-constructors/polygon-properties/st_interiorringn.md): Returns the N-th interior ring of a Polygon. This function retrieves a specific inner hole of the polygon as a LineString.
- [ST\_NumInteriorRings](https://mariadb.com/docs/server/reference/sql-statements/geometry-constructors/polygon-properties/st_numinteriorrings.md): Returns the count of interior rings in a Polygon. This function calculates the total number of inner holes within the polygon.


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