Two birds sit at the top of two different trees 17.8 feet away from one another. the distance between the first bird and a bird watcher on the ground is 37.4 feet. what is the angle measure, or angle of depression, between this bird and the bird watcher? two trees have a bird on top of each. distance between birdwatcher and first bird is 37 point 4 feet. distance between each bird is 17 point 8 feet. angle of depression between birdwatcher and first bird is unknown.