interior angle

[ɪnˈtɪriər ˈæŋɡəl]
nounpl: interior angles
ângulo interno
1. An angle formed inside a polygon between two adjacent sides
The sum of interior angles in a triangle is always 180 degrees.
A soma dos ângulos internos de um triângulo é sempre 180 graus.
2. In geometry, any angle that lies within the boundaries of a geometric figure
Each interior angle of a regular hexagon measures 120 degrees.
Cada ângulo interno de um hexágono regular mede 120 graus.
This is a technical mathematical term used uniformly across English-speaking and Portuguese-speaking countries in educational and scientific contexts. It is fundamental to geometry curricula in both Brazil and the United States, with no cultural variation in meaning or usage.
Synonyms / Sinônimos
internal angleinner angle
Antonyms / Antônimos
exterior angleexternal angle

Regional Variations

General Brazilian
ângulo interno
Standard term used in Brazilian mathematics education
São Paulo
ângulo interno
Commonly used in academic and technical contexts
Rio de Janeiro
ângulo interno
Standard usage in schools and universities
Portugal
ângulo interno
Identical usage in Portuguese mathematics terminology

Related Words

polygonvertexexterior angleangle sum theoremgeometry
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