right angle

noun

: the angle bounded by two lines perpendicular to each other : an angle of 90° or ½ π radians
right-angled adjective
or right-angle

Examples of right angle in a Sentence

A square has four right angles. Hold the nail at a right angle to the board. The two boards are joined at right angles to each other.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Another way to alternate is to mow at a right angle to your previous cut. Megan Hughes, Better Homes & Gardens, 24 May 2026 On spherical surfaces, such as that of Earth, an equilateral triangle can consist of three right angles, for instance. Manon Bischoff, Scientific American, 23 May 2026 However, laboratory studies have shown that insects tend to fly at right angles to the light source rather than directly toward it. Britannica Editors, Encyclopedia Britannica, 22 May 2026 This is a detail that maybe 20 people in the theater have the right angle to see. Dewayne Bevil, The Orlando Sentinel, 15 Apr. 2026 See All Example Sentences for right angle

Word History

First Known Use

15th century, in the meaning defined above

Time Traveler
The first known use of right angle was in the 15th century

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Cite this Entry

“Right angle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/right%20angle. Accessed 29 May. 2026.

Kids Definition

right angle

noun
: an angle whose measure is 90° : an angle whose sides are perpendicular to each other
right-angled
ˈrīt-ˈaŋ-gəld
adjective
or right-angle
-gəl

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