Applications of Trigonometric Functions

Question

A hot air balloon is rising vertically. The angle of elevation from a point on level ground 123 feet from the balloon to a point directly under the passenger compartment changes from 17.8 degrees to 33.3 degrees. How far, to the nearest tenth of a foot, does the balloon rise during this period?

Answer 1

Draw a figure!

You should then be able to write down immediately: 123(tan 33.3 - tan 17.8) as the answer.