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Altitude is the angle measured above the horizon.
the angle of incidence is the angle measured between the normal and the incident ray.. the angle of reflection is the angle measured between the reflected ray and the normal..
A reflex angle
An angle is positive when it is measured in a counter-clockwise direction. It is negative when it is measured in a clock-wise direction.
Angles are usually measured in degrees. They can also be measured in radians.