Radius, diameter, circumference & π (video) | Khan Academy
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Radius, diameter, circumference & π
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Happy Pi Day! 🥧 Today we’re looking away at arcs and focusing on approximating pi using lines… or more specifically, polygons! Archimedes approximated pi by comparing a circle to regular polygons drawn inside it and around it. The polygon inside the circle had a perimeter smaller than the circle’s circumference, while the polygon outside had a perimeter larger than the circumference. By calculating both perimeters and then increasing the number of sides, he was able to squeeze the true value of
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