Eratosthenes was able to measure the circumference of Earth by using

c) troops march forward in close formation against newer, more accurate weapons

a. always outside of government control.

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the colonists were also expected to pay a tax to meet the costs of establishing and manning the borders of the proclamation line which led to the belief that the king had sided with the indians despite pontiac's rebellion, against the interests of the settlers. this contributed to the causes of the american revolution.