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straight angle

American  

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 British  

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 Scientific  
/ strāt /
  1. An angle having a measure of 180°.


Etymology

Origin of straight angle

First recorded in 1595–1605

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

“There wasn’t a straight angle in the whole building,” Mr. Easter said.

From New York Times Apr. 12, 2010

Citing everything from the Milky Way to a doughnut, Mr. Fujiwara made straight angle tailoring credible, as well as the rounded version of the wind coats that Mr. Miyake invented three decades ago.

From New York Times Mar. 5, 2010

The terms "complement," "supplement," and "conjugate," meaning the difference between a given angle and a right angle, straight angle, and perigon respectively, have also entered our vocabulary and need defining.

From The Teaching of Geometry by David Eugene Smith

This might be postponed until after the problem to bisect an angle, since it merely requires the bisection of a straight angle; but considering the immaturity of the average pupil, it is better given independently.

From The Teaching of Geometry by David Eugene Smith

It is found to be better pedagogy to assume that this follows from the definition of straight angle, with reference, if necessary, to the meaning of the sum of two angles.

From The Teaching of Geometry by David Eugene Smith

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