CORRECT!

9). The term 'angle of attack' is defined as the angle

a). formed by the longitudinal axis of the airplane and the chord line of the wing.
b). between the airplane's climb angle and the horizon.
c). between the wing chord line and the relative wind.
The answer is:
c). between the wing chord line and the relative wind.

The chord line of a wing is the distance between the leading edge and trailing edge of a wing measured in the direction of the normal airflow. In normal straight-and-level flight, the chord line is essentially horizontal and the relative wind is flowing over the wing from front to back. There is only a small angle between the chord line and the relative wind.

If the aircraft's pitch attitude (and thus, the chord line) changes in relation to the relative wind, the angle of attack changes as well. The angle of attack can increase until what is defined as the 'critical angle of attack' is exceeded, after which the wing can no longer generate lift and the wing is aerodynamically stalled. Click on the link below for a graphic showing this process.

Angle of Attack and Aerodynamic Stall

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