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## Homework Statement

Two people 1.8m tall walk directly away from each other until they can no longer see each other. [Due to the curvature of the Earth radius of about 6378km]

**The part of this question I don't get which I am trying to find is how to get this part.**

Assuming nothing else blocks their view, how far do they have to walk to not see each other? [Hint look for the length of the arc.]

## Homework Equations

Dont know how to show my working out. I am in the diagram stage. And trying to get a formula. Just can't remember fully what I am doing.

## The Attempt at a Solution

For a attempt, well I get know were. And my txt books are no help. All talking about it in graph format.