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Bringing Music and Fashion Together Since 2005 The Hottest Dubstep Songs on the Planet - uDubstep dot com Gilly Hicks - Shop Official Site To Write Love On Her Arms Official Online Store Law of Cosines: Formula and examples of the law of cosines and a free worksheet Law of Cosines Formula Video Tutorial of Law on Law of Cosines Interactive Demonstration of the Law of Cosines Formula The interactive demonstration below illustrates the Law of cosines formula in action. Drag around the points in the triangle to observe who the formula works. The two common problems types that are suitable for the law of cosines are. Problem type 1: when you know the lengths of 2 sides of a triangle and the angle in between the two sides Problem type 2: when you know the lengths of three sides of a triangle and want to know a particular angle Example of Law of Cosines Formula x² = 10² + 14² −2(10)(14)cos(44°)x² = 296 −280cos(44)x² = 94.6 Practice applying Law of Cosines Law of Cosines to Find a Side Length Practice Problem 1) Use the law of cosines formula to calculate the length of side A. Practice Problem 2) Use the law of cosines formula to calculate the length of side A. Practice Problem 3)Use the law of cosines to calculate the length of side x. Practice Problem 3)