結果 : how is circumference measured
0:59

How to Calculate the Circumference of a Circle

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How Eratosthenes calculated the Earth's circumference

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Measuring Circumference

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#firethelaser #lasertools #xtool #laserengraving circumference measuring tool AlivePixelCreates.com

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Carl Sagan explains how Eratosthenes calculated circumference of the Earth

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How To Calculate The Circumference of a Circle

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Measuring Circumference and Diameter Open Up Activity 3.2

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Measure the Earth’s Radius! (with this one complicated trick)

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