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?

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Joseph L. Zachary
Hamlet Project
Department of Computer Science
University of Utah