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Measuring the Circumference of the Earth

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Author: Annie Fetter
Description: teacher support active problem Geometry, difficulty level 3. At our office on the autumnal equinox, the angle formed by the sun's rays and a stick is 40 degrees. If our office is 2749 miles from the equator, what's the circumference of the Earth?
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Problem page: http://mathforum.org/librarypow/puzzles/index2.ehtml?puzzle=2727
Support page: http://mathforum.org/pow/support/geopow/earth.teacher.html
Solution page: Problem #2727

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