Two birds sit at the top of two different trees. The distance between the first bird and a birdwatcher on the ground is 29. 7 feet. The distance between the birdwatcher and the second bird is 42. 1 feet. What is the angle measure, or angle of depression, between this bird and the birdwatcher? Two trees that are 29 point 7 feet tall with a bird on top of each. Distance between birdwatcher and first bird is 42 point 1 feet. Angle of depression between birdwatcher and first bird is unknown. © 2011 Jupiter Images Corporation 45. 1° 44. 9° 54. 8° 35. 2°.