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perimeter

geometry_algorithm::length

Function perimeter 

Source 
pub fn perimeter<P>(
    p: &P,
) -> <DefaultPerimeterStrategy<P> as LengthStrategy<P::Ring>>::Out
where
    P: Polygon,
    <<<P as Geometry>::Point as Point>::Cs as CoordinateSystem>::Family: DefaultPerimeter<<<<P as Geometry>::Point as Point>::Cs as CoordinateSystem>::Family>,
    DefaultPerimeterStrategy<P>: LengthStrategy<P::Ring> + Default,
Expand description

Perimeter of a polygon: length of the exterior ring plus the sum of the lengths of the interior rings.

Mirrors boost::geometry::perimeter from boost/geometry/algorithms/perimeter.hpp:230-236.