Cosine rule Post author By Rik D. Tangerman Post date December 10, 2020 No Comments on Cosine rule Relation between triangle side lengths and one of its angles: c2=a2+b2-2abcosγ. ← Circular sector → Octagon Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment. Δ Optionally add an image (JPEG only)