Trailing edge is the part of an airfoil that hits the air particles last.

• A. Leading Edge
• B. Nose
• C. Trailing Edge
• D. Mid-Chord

Answer: (C)

The main idea here is understanding airfoil edges and how the airflow interacts with them. The edge at the front of the wing is the leading edge—the first part of the airfoil to meet the oncoming air. As the air flows over and under the wing, it stays in contact with the surface and moves toward the back, finally leaving at the rear edge, which is the trailing edge. So the trailing edge is the rear boundary of the wing, where the flow finishes its passage along the surface. That makes it the part that the air meets last in the direction of travel.

The other terms don’t fit this description: the front edge is the leading edge, not the part described; the nose isn’t a standard airfoil term; and mid-chord refers to a point along the chord, not an edge at the back.