180-degree angle
[/wʌn ˈeɪti dɪˈɡriː ˈæŋɡəl/]
nounpl: 180-degree angles
ângulo de 180 graus
1. A geometric angle that measures exactly 180 degrees, forming a straight line where two rays extend in opposite directions from a common point
When you draw a straight line, you are essentially creating a 180-degree angle.
Quando você desenha uma linha reta, você está essencialmente criando um ângulo de 180 graus.
2. In mathematics and geometry, an angle formed by two half-lines that are collinear and point in opposite directions
The hands of a clock form a 180-degree angle at six o'clock.
Os ponteiros de um relógio formam um ângulo de 180 graus às seis horas.
In both English and Portuguese mathematical education, the 180-degree angle is a fundamental concept taught in geometry classes. The term 'straight angle' is commonly used in English-speaking countries, while 'ângulo raso' is frequently used in Portuguese-speaking educational settings. The informal expression 'do a 180' derived from this geometric concept is used colloquially in American English to describe complete reversals of opinion or direction, with equivalent usage in Brazilian Portuguese ('fazer uma guinada de 180 graus').
Related Idioms & Phrases
do a 180 (idiom: to completely reverse one's opinion or direction)
fazer uma guinada de 180 graus (idiom: to make a complete turnaround)
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