law of cosines

1
: a law in trigonometry: the square of a side of a plane triangle equals the sum of the squares of the remaining sides minus twice the product of those sides and the cosine of the angle between them
2
: a law in trigonometry: the cosine of an arc of a spherical triangle equals the product of the cosines of the remaining arcs plus the product of the sines of those arcs and the cosine of the angle between them

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Cite this Entry

“Law of cosines.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/law%20of%20cosines. Accessed 6 Dec. 2022.

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