Many distances are impossible to measure directly. Yet almost 2,000 years ago, a man named Eratosthenes was able to measure the size of the earth by using his knowledge of geometry.
Phoenix Learning Group, 2349 Chaffee Dr., St. Louis, MO 63146, Phone: (314)569-0211, Toll-free: 800-221-1274, Fax: (314)569-2834, URL: http://www.phoenixlearninggroup.com
Available on VHS
Running time 12 minutes.
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