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Screenshot of How Earth’s size was computed by Eratosthenes
How Earth’s size was computed by Eratosthenes
Screenshot of How Eratosthenes calculated the Earth’s circumference
How Eratosthenes calculated the Earth’s circumference
Screenshot of How many panels on a soccer ball?
How many panels on a soccer ball?
Screenshot of How Simple Ideas Lead to Scientific Discoveries - Adam Savage
How Simple Ideas Lead to Scientific Discoveries - Adam Savage
Screenshot of How tall is a tree?
How tall is a tree?
Screenshot of How to create an ellipse
How to create an ellipse
Screenshot of How to derive the area of a circle
How to derive the area of a circle
How to Draw a Perfect Circle Freehand
Screenshot of How to Draw Spirals
How to Draw Spirals
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