3. Sketch then solve each triangle using the cosine law. Round your answers to the nearest tenth of a unit. a) In AXYZ, XY = 40.6 m, XZ = 38.9 m and YZ = 12.7 m Lesson 3: Project Page 3 4. To measure the length of a pond, a surveyor places takes at points A, B and C as shown in the diagram. AB measures 23.1 m and BC measures 19.4 m. Lesson 3: Cosine Law Instructions: Complete the following project by writing your full solutions on separate paper. When finished, electronically submit your work into your course dropbox for Putting Math to Work: Lesson 3 Part A Making Decisions Using Trigonometry In this lesson you looked at how to use the cosine law. State the cosine law that would be used to find: a) the length of an unknown side given two sides and a contained angle. b) the measure of a given angle given the three sides of a triangle. In your answer include a diagram and an example to explain your answers. Lesson 3: Project Page 1 Part B: Solve these questions using the cosine law. 1. Find the measure of y in this diagram. 6.0 m 2 280 6.5 m 2. Find the measure of