supplementary angle

noun

Definition of supplementary angle

: one of two angles or arcs whose sum is 180° usually used in plural

First Known Use of supplementary angle

circa 1924, in the meaning defined above

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The first known use of supplementary angle was circa 1924

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Cite this Entry

“Supplementary angle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/supplementary%20angle. Accessed 3 Dec. 2020.

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