KnowraLaw of cosinesLinked fromLinked fromThe 27 pages that link to Law of cosines, each with the reason it gives.All 27Related 20Narrower topic 1Compared with 6Right triangleCompared with: It handles general triangles, while the Pythagorean theorem is its right-angle case.Law of sinesCompared with: It handles side-angle configurations where the law of sines does not directly determine the unknown.Spherical law of cosinesCompared with: Its flat-space formula is the limiting counterpart of the spherical law.Pythagorean trigonometric identityCompared with: Unlike the Pythagorean identity, it relates three side lengths in a general triangle.De Gua's theoremCompared with: It handles non-right triangular geometry, whereas De Gua's theorem requires three perpendicular edges.Law of cotangentsCompared with: It constrains side lengths and angles rather than a sum of cotangent products.