Ciarra, who is 5 ft tall, Is standing on the roof of a 66 ft tall building looking at the horizon. She hears barking and looks down to see a small dog across the street sniffing at a fire hydrant. Ciarra estimates that she is about 84 ft from the fire hydrant. Find the angle of depression that Ciarra’s line of sight makes from when she is looking at the horizon to when she looks down at the dog.