Watch video PreCalculus - Trigonometry: The Law of Cosines (10 of 15) Finding 3 Angles Given 3 Sides online without registration, duration 05 minute 00 second in high hd quality. This video was added by user Michel van Biezen 06 August 2014, don't forget to share it with your friends and acquaintances, it has been viewed on our site 29 thousand once and liked it 29 people.