Advanced Precalculus Notes 7.3 The Law of Cosines Law of Cosines:

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Presentation transcript:

Advanced Precalculus Notes 7.3 The Law of Cosines Law of Cosines:

Solve the triangle: a = 2, b = 3, C = 60º Solve the triangle: a = 4, b = 3, c = 6

A motorized sailboat leaves Naples, Florida, bound for Key West, 150 miles away. Maintaining a constant speed of 15 mph, but encountering heavy crosswinds and strong currents, the crew finds, after 4 hours, that the boat is off course by 20º. a) How far is the sailboat from Key West at this time? b) Through what angle should the sailboat turn to correct its course? c) How much time has been added to the trip because of this if the speed remains constant?

Assignment: page 546: 1 – 9, 15, 24, 28, 30, 34, 35, 39