closed line
[/kloʊzd laɪn/]
nounpl: closed lines
linha fechada
1. A geometric line or curve that forms a complete loop with no endpoints, where the starting and ending points are the same
A circle is a closed line that curves back on itself.
Um círculo é uma linha fechada que se curva sobre si mesma.
2. In telecommunications or transportation, a line that is restricted or not open to the general public
The railway operates a closed line reserved for freight only.
A ferrovia opera uma linha fechada reservada apenas para carga.
3. A boundary or perimeter that completely encloses an area
The security team marked a closed line around the restricted zone.
A equipe de segurança marcou uma linha fechada ao redor da zona restrita.
This term is primarily used in technical, mathematical, and transportation contexts in both Brazil and Portugal. In mathematics education, 'linha fechada' is a fundamental concept taught alongside topology and geometry. In transportation systems, especially in major Brazilian cities like São Paulo and Rio de Janeiro, 'linha fechada' indicates restricted transit routes.
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