Angles of elevation and depression. If a person stands and looks up at an object, the angle of elevation is the angle between the horizontal line of sight and the object.

Also the angle of elevation and depression from the surface of the lake is same. Here the man is standing on a platform 3m above the surface , ...

Angles of elevation and depression. If a person stands and looks up at an object, the angle of elevation is the angle between the horizontal line of sight and the object.