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What was one contribution made by Eratosthenes in ancient Greece?
O He wrote a geometry textbook that was used for nearly 2,000 years.
O He calculated the value of the infinite number known as pi.
O He computed the circumference of planet Earth.
O He developed military tactics that still apply today.
The correct answer is: He computed the circumference of planet Earth.
Eratosthenes, a Greek mathematician and astronomer, is renowned for estimating the Earth’s circumference with remarkable accuracy for his time. He used the angles of shadows cast by the Sun at different locations in Egypt, along with the distance between those locations, to make his calculation. His work laid the groundwork for later geography and cartography.