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°

---

straight angle Scientific  

/ strāt /

1. An angle having a measure of 180°.

---

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

Pupils will find it interesting to cut off the corners of a paper triangle and fit the angles together so as to make 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

In the first place it expressly excludes the straight angle, and, indeed, the angles of Euclid are always less than 180°, contrary to our modern concept.

From The Teaching of Geometry by Smith, David Eugene