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## Homework Statement

You are lying down on a beach watching the sunset. You start a stop watch the instant the sun's top disappears below the horizon and stand up, elevating your eyes by 1.70 meters. Exactly 11.1 seconds later, you stop the watch as the sun once again disappears below the horizon. What is the Earth's radius?

## Homework Equations

I think some work with triangles might be involved.

## The Attempt at a Solution

Perhaps the circumference of the Earth could be calculated first. The Earth has rotated [tex]\frac{11.1 sec}{86400 sec}[/tex]=0.04625 degrees. From here, I'm confused what to do next. I'm pretty sure there's an easier way to do this though.