1. Math
2. Trigonometry
3. eratosthenes was a greek mathematician who lived 276194 bc at...

# Question: eratosthenes was a greek mathematician who lived 276194 bc at...

###### Question details
Eratosthenes was a Greek mathematician who lived 276-194 BC. At summer solstice he waited until noon, when the sun was directly overhead in Aswan. He placed a gnomon (basically a stick) at the bottom of the well at 90° to the ground, and noticed that it cast no shadow. Then at the same time he had others place a gnomon in Alexandria. He found that the tip of the gnomon made an angle of 7° to the edge of the shadow, where the gnomon was again at 90° with the ground. Based on records at the Library of Alexandria, he knew that the distance from Aswan to Alexandria was 5,000 stadia.
1. Draw a picture (or several), and then make a calculation for the circumference and radius of the earth, in stadia. Explain all your steps.