adjacent angle

noun

plural adjacent angles

geometry

: one of a pair of angles in a geometric figure that have a common vertex (see vertex sense 2b) point and also share a side

Word History

First Known Use

1645, in the meaning defined above

Time Traveler

The first known use of adjacent angle was in 1645

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Style

“Adjacent angle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/adjacent%20angle. Accessed 25 Aug. 2026.

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adjacent angle

noun

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