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

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

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 Smith, David Eugene