Final answer:
A planing hull is designed to ride on top of the water, reducing drag and increasing speed.
Step-by-step explanation:
A planing hull has the characteristic of a. It is designed to ride on top of the water. This means that the hull is shaped in such a way that when the boat is moving at high speeds, it creates lift, allowing it to rise above the surface of the water. This reduces drag and increases speed. Examples of boats with planing hulls include speedboats and water skis.