What is angle of depression?
The angle of depression:
The angle of depression is an angle formed between the horizontal line and the line of sight when an observer looks toward an object.
A man 1.8 metres tall, looking down from the top of a telephone tower sees the top of a building 10 metres high at an angle of depression 40° and the foot of the building at an angle of depression 60°. What is the height of the tower? How far is it away from the building?