It is not known when, or even if, Euratosthenes did calculate the circumference of the earth.
However, it is known that a very accurate estimate was obtained by Eratosthenes in the early years of the third century BC.
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to calculate circumference you find a circles radius or diameter. you do diameter times pi or radius times 2 times pi. the you have circumference!
how do you calculate the circunference of hemisphere?
His prime objective was to measure a degree on the equator to calculate the circumference of the earth.Studies have shown there has been a large increase in waist circumference in young people.The earth's circumference was accurately measured around 240 BCE by Eeratosthenes.It isn't easy to measure the circumference of large items.
pi times diameter = circumference
The answer will depend on what is meant by "how do you you do" or even "how do you do". I do not do circumference. A can draw it, I can calculate it, I can calculate other measures (area, radius, diameter) from it but I do not DO it!