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straight angle

noun

  1. the angle formed by two radii of a circle that are drawn to the extremities of an arc equal to one half of the circle; an angle of 180°.


straight angle

noun

  1. an angle of 180°
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


straight angle

/ strāt /

  1. An angle having a measure of 180°.


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Word History and Origins

Origin of straight angle1

First recorded in 1595–1605
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Example Sentences

We basically lay out really long tape using compasses to make straight angles.

That there exists a triangle, the sum of whose angles is congruent to a straight angle, the Euclidean; II.

The elliptic or Cayley-Klein hypothesis assumes that the angular sum is greater than a straight angle.

That there exists a triangle the sum of whose angles is greater than a straight angle, the Cayley-Klein.

This was excluded by the Greeks because their idea of angle required it to be less than a straight angle.

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straight and narrowstraight-arm