The problem asks: ``How far away (in feet) can your friend get before he
disappears from view?'' Does this mean the distance along the line of sight
from you to your friend? The distance down the slope of Kitty Hawk to the
sound, and from there along the water to your friend? Should we assume that
you are standing up and take your height into account?
Return to lesson.
Joseph L. Zachary
Department of Computer Science
University of Utah