Eratosthenes air-uh-TOS-thuh-neez 2,000 BC What is the circumference of this apple pie? (Given: you know about one piece) 90º ---- = 360º 10" ----?" What is the circumference of this apple pie? (Given: you know about one piece) What part of a circle is 90º? 90º ---- = 360º 10" ----?" What is the circumference of this apple pie? (Given: you know about one piece) ¼, so take 10” times 4. 90º ---- = 360º 10" ----?" What is the circumference of this apple pie? (Given: you know about one piece) 10” times 4 = 40” (or 10 / .25 = 40) 90º ---- = 360º 10" ----40" What is the circumference of this pizza? 45º ---- = 360º 9" ----?" What is the circumference of this pizza? 45º ---- = 360º 9" ----?" What part of a circle is 45º ? What is the circumference of this pizza? 45º ---- = 360º 9" ----?" 1/8 , so take 9” times 8. What is the circumference of this pizza? 45º ---- = 360º 9" ----72" so 9” times 8 = 72” (or 9 / 0.125 = 72) What is the Circumference of the Earth? Eratosthenes air-uh-TOS-thuh-neez 2,000 BC ? % of a circle = 7.2º 925 km ---- = ---------360º ? km H om ew ork: Page 4 What is the Circumference Eratosthenes 2,000 BC air-uh-TOS-thuh-neez 7.2º 1/50 = ---- = 360º 925 km ---------? km (Next, take 925 km times 50) What is the Circumference 7.2 / 360 = 0.02 925 / 0.02 = 46,250 7.2º 1/50 = ---- = 360º 925 km ---------46,250 km
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