Question

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.

Explanation:

Eratosthenes, a Greek mathematician, geographer, etc., is known for accurately computing the circumference of the Earth using simple geometric principles and observations of the sun's position at different locations. He did not write a geometry textbook used for 2000 years (Euclid is more associated with geometry textbooks), did not calculate the value of pi (though others like Archimedes made significant contributions to pi - related calculations), and was not known for developing military tactics.

Answer:

He computed the circumference of planet Earth.