Communication

1) Suppose that cos=-0.38. Explain how we can use this information to determine which quadrant(s) is in.

2) Explain the possible pitfall of using Sine Law to solve for the largest angle in a triangle.

3) Triangle ABC has sides a = 8, b = 6 and angle B = 40°. Sidney notices that this is an ambiguous case and concludes that since ab, the triangle has one solution. Explain clearly why this is incorrect. Include a sketch supporting your answer.

4) True or False: 405° = -315°. Explain clearly, using sketches to support your answer.

5) True or False: If sinA = sinB then we can conclude that Z4=