College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

Exercise 16

A student wants to determine the distance from the lakeshore to a small island (Fig.). He first draws a 50-m line parallel to the shore. Then, he goes to the ends of the line and measures the angles of tire lines of sight from the island relative to the line he has drawn. The angles are 30° and 40°. How far is the island from the shore

FIGURE Measuring with lines of sight See Exercise.