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°

straight angle

/ strāt /

1. An angle having a measure of 180°.

Word History and Origins

Origin of straight angle¹

First recorded in 1595–1605

Example Sentences

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

From Freakonomics

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg