straight angle
- noun
- /streɪt ˈæŋɡəl/
- Specialized
:
ángulo recto
- A wedge of pillows propped him at a straight angle from waist to head.
Examples
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Now let's take that straight angle ABC and let's cut that in half, perfectly in half.
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This proves that the three angles add to a straight angle.
Fiction book (2001) -
It proves the inside angles must add up to a multiple of a straight angle.
Fiction book (2001) -
The three angles in the triangle add up to a straight angle of 180 degrees.
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When measuring a straight angle, you can see that it forms a perfectly straight line.
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In geometry class, we learned that a straight angle is exactly 180 degrees.
How Big
- Specialized
- Specialized
- Specialized
1
3.4
- Specialized
401
2.5
- Specialized
16
2.4
- Specialized
1
2.8
Surface Forms
Morphology
The meaning 'an angle of 180 degrees forming a straight line' is directly and compositionally derivable from 'straight' (forming a line) plus 'angle' (the figure between two lines). This is a transparent, domain-specific mathematical term with similar constructions cross-linguistically, so a B1 learner who knows the constituents would readily infer the meaning.
Etymology
Straight angle comes from the simple image of an angle that is perfectly straight: imagine a clock at 6 o'clock when the hands point in opposite directions and make one straight line. So it means 'an angle of 180 degrees', like half of a circle.