Precalculus 4.8 Applications and Models Bellwork 1.Use your unit circle to find the possible values of  2.Use a calculator to find the value. arcsin ¼ arctan -9.65

4.8 Applications and Models Objectives: Use right triangles to solve real-life problems. Use directional bearings to solve real-life problems.

Precalculus 4.8 Applications and Models 3 Terminology Angle of elevation – angle from the horizontal upward to an object. Angle of depression – angle from the horizontal downward to an object. Horizontal Observer Angle of elevation Object Horizontal Observer Angle of depression Object

·Solve the missing sides of the triangle Precalculus 4.8 Applications and Models 4 25° 5 x y

Example 150 feet 60 0

Precalculus 4.8 Applications and Models 6 30 feet 10 feet Example Find all the missing sides and angles of the triangle