Eratosthenes
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What answer did he get?
240,000 stadia
How did Eratosthenes measure the circumference of the Earth?
He used geometry and ratios to determine the size of the Earth, by basing his calculations on observations of the sun.
How did he come to an answer?
He used simple geometry he set up an equation that determined the circumference of the earth.
Who was Eratosthenes?
The 1st person able to measure the circumference of the Earth (came within a couple hundred km of actual value).
What did he assume?
The earth is round and the sun's rays are parallel.