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°.

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straight angle British  

noun

1. an angle of 180°

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straight angle Scientific  

/ strāt /

1. An angle having a measure of 180°.

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Etymology

Origin of straight angle

First recorded in 1595–1605

Example Sentences

“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

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

From The Teaching of Geometry by Smith, David Eugene

Welding Angle Iron.—Let it be required to form a piece of straight angle iron to a right angle.

From Modern Machine-Shop Practice, Volumes I and II by Rose, Joshua

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 Smith, David Eugene