supplementary angle
[ˌsʌp.lə.ˈmen.tə.ri ˈæŋ.ɡəl]
nounpl: supplementary angles
ângulo suplementar
1. Two angles that together sum to 180 degrees or π radians; two angles whose measures add up to a straight angle
A 120-degree angle and a 60-degree angle are supplementary angles because they add up to 180 degrees.
Um ângulo de 120 graus e um ângulo de 60 graus são ângulos suplementares porque somam 180 graus.
2. In geometry, adjacent supplementary angles form a linear pair on a straight line
The two supplementary angles on either side of a line segment form a straight line.
Os dois ângulos suplementares em ambos os lados de um segmento de reta formam uma linha reta.
This is a fundamental concept in geometry curricula in both American and Brazilian mathematics education. In Brazil, it is typically introduced in middle school (ensino fundamental) as part of geometry studies. The concept is essential for understanding angle relationships and is used consistently across both English and Portuguese mathematical texts with minimal regional variation.
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