FAA Private Pilot Test Prep

Correct Answer: B. The chord of the wing and the relative wind direction across it. Recall that the chord of the wing is an imaginary line down the center of the wing. As the plane moves through the air, this chord is the measure of the angle of attack. This is why it is possible that, even in a dive, the angle of attack could be too great and cause a stall. So the chord angle compared to relative air flow is the angle of attack.