Cornell University
Cornell University: Astronomy: Eratosthenes
Learn how Greek mathematician Eratosthenes used geometry to estimate the circumference of the Earth.
Mocomi & Anibrain Digital Technologies
Mocomi: What Is Circle?
Discusses the radius, diameter, circumference, and area of a circle.
University of St. Andrews (UK)
University of St. Andrews: Eratosthenes of Cyrene
Gives details of the accomplishments of Eratosthenes in the field of mathematics.
National Institutes of Health
Nih: Aim for a Health Weight
This brief but informative site discusses the role of body mass index and waist circumference in determining your risk of disease and death.
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