What was one contribution made by eratosthenes in ancient greece? he wrote a geometry textbook that was used for nearly 2,000 years. he calculated the value of the infinite number known as pi. he computed the circumference of planet earth. he developed military tactics that still apply today.

One contribution made by Eratosthenes in ancient Greece was He computed the circumference of planet Earth. He was a Greek mathematician, astronomer, geographer, and poet. He invented the discipline of Geography. His calculation of the circumference of planet Earth was remarkably accurate, and he also calculated the distance from Earth to the Sun.

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