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supplementary angles

plural noun
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Definition of supplementary angles

: two angles or arcs whose sum is 180 degrees

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First Known Use of supplementary angles

circa 1924, in the meaning defined above

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The first known use of supplementary angles was circa 1924

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Cite this Entry

“Supplementary angles.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/supplementary%20angles. Accessed 8 December 2019.

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