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*Feb 06, 2014 · A simple worksheet with cosine rule questions. This website and its content is subject to our Terms and Conditions.*#4 Use the law of Sines to calculate the area of the following triangles: B = 130 deg, a=62, c = 20 C = 84deg 30 minutes, a = 16, b = 20 #5 An oil tanker and a cruise ship leave port at the same time and travel in straight-line courses at 10mph and 25 mph, respectively. Law of Cosines or Cosine Law . Objective: I know how to use the Law of Cosines or Cosine Law to solve triangles. The Law of Cosines, for any triangle ABC is . a 2 = b 2 + c 2 – 2bc cos A . Refer to the lesson on the law or cosines or cosine law for more information and examples. 10.1 Graphing Sine and Cosine - Pre-Calculus ... Pre-Calculus