perched high on the edge of a vertical cliff, pterrance the pterodactyl gazes down with a 25 degree of depression and spots his prey, Larry the lamma,. pterrance flies 1000 feet in a straight path and snatches larry. how high is the cliff pterrance was on? Please help me. (this is geometry)

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?