Question

euclid was an ancient greek scholar who
wrote a geometry textbook that was used for nearly 2,000 years.
calculated the value of the infinite number known as pi.
computed the circumference of planet earth.
developed military tactics that still apply today.

Explanation:

Euclid is well - known for writing Elements, a geometry textbook that had a long - lasting influence and was used for nearly 2,000 years. The calculation of pi is often associated with Archimedes, the computation of Earth's circumference with Eratosthenes, and military tactics are not Euclid's main contribution.

Answer:

wrote a geometry textbook that was used for nearly 2,000 years.