exterior angle

[ɪkˈstɪriər ˈæŋɡəl]
nounpl: exterior angles
ângulo externo
1. An angle formed between one side of a polygon and the extension of an adjacent side
The exterior angle of a triangle equals the sum of the two non-adjacent interior angles.
O ângulo externo de um triângulo é igual à soma dos dois ângulos internos não adjacentes.
2. In geometry, an angle located outside a polygon at each vertex
Each exterior angle of a regular hexagon measures 60 degrees.
Cada ângulo externo de um hexágono regular mede 60 graus.
This is a technical mathematical term used universally in geometry education across English-speaking and Portuguese-speaking countries. No cultural variations in usage exist; it maintains consistent meaning in mathematics curricula in both Brazil and the United States.
Synonyms / Sinônimos
external angleouter anglesupplementary angle (in context)
Antonyms / Antônimos
interior angleinternal angle

Regional Variations

General Brazilian
ângulo externo
Standard term used in Brazilian mathematics education
São Paulo
ângulo externo
Same as general Brazilian Portuguese
Rio de Janeiro
ângulo externo
Same as general Brazilian Portuguese
Portugal
ângulo exterior
Alternate form used in Portugal; both 'exterior' and 'externo' are acceptable

Related Words

interior anglepolygonvertexsupplementary anglegeometrytriangleadjacent
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