What is the angle of depression between a woman in a hot air balloon that is 94 feet off the ground and her friend that is 200 feet from being directly underneath the balloon?

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?