straight angle

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noun

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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Do you know the difference between everyday US and UK terminology? Test yourself with this quiz on words that differ across the Atlantic.

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In the UK, COTTON CANDY is more commonly known as…

candystring

candyfloss

candypuff

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Origin of straight angle

First recorded in 1595–1605

Words nearby straight angle

straggly, straight, straight A, straight-ahead, straight and narrow, straight angle, straight-arm, straight arm lift, straight arrow, straight as an arrow, straightaway

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use straight angle in a sentence

We basically lay out really long tape using compasses to make straight angles.
How Stupid Is Our Obsession With Lawns? (Ep. 289 Rebroadcast)|Stephen J. Dubner|July 1, 2021|Freakonomics
That there exists a triangle, the sum of whose angles is congruent to a straight angle, the Euclidean; II.
The Mystery of Space|Robert T. Browne
The elliptic or Cayley-Klein hypothesis assumes that the angular sum is greater than a straight angle.
The Mystery of Space|Robert T. Browne
That there exists a triangle the sum of whose angles is greater than a straight angle, the Cayley-Klein.
The Mystery of Space|Robert T. Browne

This was excluded by the Greeks because their idea of angle required it to be less than a straight angle.
The Teaching of Geometry|David Eugene Smith

British Dictionary definitions for straight angle

straight angle

noun

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

Scientific definitions for straight angle

straight angle

[ strāt ]

An angle having a measure of 180°.