Eratosthenes Meets the GPS
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Date
2010
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Publisher
Ohio Council of Teachers of Mathematics
Abstract
Multiple representations of a problem encourage students to make and strengthen connections across mathematics.
This article presents three solution methods that students can use to estimate the Earth's circumference.
All solution methods involve proportional reasoning, require physical measurements, and draw upon
basic concepts of geography, notably longitude and latitude. They range from a geometric representation
first proposed by ancient Eratosthenes using simple measuring devices of meter sticks and protractors (with
and without use of trigonometry) to the use of modern Global Positioning System (GPS) units.
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Citation
Ohio Journal of School Mathematics, no. 62 (2010), 11-16.