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Alexander Overwijk draws a perfect freehand circle 1m in diameter in less than a second.
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Circle terminology and formulas in song form. Center, radius and diameter are mentioned as well as the area and circumference formulas. The song helps students remember these terms and formulas.
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Live footage of the first ever World Freehand Circle Drawing Championship in Ottawa, Ontario (visit www.freehandcircles.com).
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Learn circumference, radius, pi and more through music! From the Math Upgrade course at learningupgrade.com.