You are standing on the ground, watching a bird fly away horizontally at a rate
You are standing on the ground, watching a bird fly away horizontally at a rate of 9 meters per second. the bird is initially located 25 meters above your head. let θ be the angle measured from the vertical direction to the direction from you to the bird. how fast (in radians per second) is θ changing when the horizontal distance between you and the bird is 12 meters