What was one contribution made by eratosthenes in ancient greece

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

b. he calculated the value of the infinite number known as pi

c. he computed the circumference of planet earth

d. he developed military tactics that still apply today

Born in Cyrene around the year 276 BC, Eratosthenes was an Ancient Greek mathematician and thinker, he even was the leader for some time of the famous Library of Alexandria. He is attributed to have invented geography.  

In one of Eratosthenes' most famous experiments, he compared the altitudes of the sun in the sky, in two different locations, one in a northern land and the other one in the south.  With these two altitudes, he was able to mathematically calculate with an impressive presition the circumference of the Earth, for this, and other important achievements, some historians state he was way ahead of his time.

So the correct answer is C.) He computed the circumference of planet earth

(C)-He computed the circumference of planet Earth.

Explanation:

I just know :)

the noble might have thought that the system was far because they had lot of things and riches and the serf would have thought that the feudal system was un fair because of the way they were treated.

answer: held for the purpose of bringing nazi war criminals to justice, the nuremberg trials were a series of 13 trials carried out in nuremberg, germany, between 1945 and 1949

explanation: