https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:trig/x9e81a4f98389efdf:law-of-cosines/v/law-of-cosines-example 2021-04-07T10:59:30Z Solving for a side with the law of cosines Learn how to use the law of cosines to find the missing side length of a triangle when given two side lengths and the contained angle measure. Sal Khan video https://cdn.kastatic.org/googleusercontent/DaAhZigTYTg0jYhdeNQusud7XfeHWCiT4KFff-g-r45ngAWWdtK3wk1FZDriWv-_ls8jOcaLREx2oq5g67wjAJcp Solving for a side with the law of cosines Learn how to use the law of cosines to find the missing side length of a triangle when given two side lengths and the contained angle measure. https://cdn.kastatic.org/ka-youtube-converted/ZElOxG7_m3c.mp4/ZElOxG7_m3c.mp4 278 Law of cosine https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:trig/x9e81a4f98389efdf:law-of-cosines/e/law_of_cosines 2026-03-24T23:41:07.080866137Z Solve triangles using the law of cosines Solve missing triangle measures using the law of cosines. Ben Eater exercise https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:trig/x9e81a4f98389efdf:law-of-cosines/v/law-of-cosines-missing-angle 2021-04-07T10:59:29Z Solving for an angle with the law of cosines Sal is given a triangle with all side lengths but no angle measure, and he finds one of the angle measures using the law of cosines. Sal Khan video https://cdn.kastatic.org/googleusercontent/0ssPaOePflPJ5nkwPeo0o23fvVY1ncxcrvuRqiLqWjC0rR4FEcnDK3OcmUgCszkW0y51gYjj49BoDAbpGP03UWSf Solving for an angle with the law of cosines Sal is given a triangle with all side lengths but no angle measure, and he finds one of the angle measures using the law of cosines. https://cdn.kastatic.org/ka-youtube-converted/Ei54NnQ0FKs.mp4/Ei54NnQ0FKs.mp4 401 Law of cosine