Angle of elevation and Angle of depression(仰角和俯角)
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many stars tom(ch1test) BridgesS Final Project1 Lens Simulation for iPad Angles of Elevation and Depression
Exploring Base & Height in Triangles and Related Parallelograms Geometry: Explore Angles of Elevation and Depression
Geometry of an airborne Infrared (IR) search.
Altitude is given in feet AGL, Depression is the angle down from the horizon.