Returns the perimeter of an area geometry.
If the geometry is a point or a line, the result will be 0. If the geometry is a complex geometry, the result will be the sum of the perimeters of each simple area geometry in the complex geometry.
Parameter 1 - any geometry.
Returns: the total length of the inner and outer rings of the geometry.
Note: This function does not fully support 3D geometries. Any 3D geometries will be projected down to 2 dimensions.