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@@ -2594,13 +2594,25 @@ <h4>Archimedes and the Illusion of Limits</h4>
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<p>Archimedes approximated the circumference using inscribed and circumscribed polygons. He began with a circle bounded by an inscribed and a circumscribed hexagon — not the absolute minimum of 3 or 4 sides — likely because the hexagon is closer to the circle while still being easily calculable. By bisecting the angles (splitting them in half), he turned the hexagons into a 12-gons, then 24-gons, all the way to 96-sided shapes. This allowed him to calculate the perimeter of these shapes using only straight lines and Pythagoras' theorem.
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However, this method relies on a massive assumption: That a polygon with enough sides approaches a circle.
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Observing how the difference between the two polygonal perimeters — one inside the circle, one outside — became smaller, Archimedes likely believed that as the number of sides increased, the difference between the perimeters of the inscribed and circumscribed polygons would converge toward zero, approaching the circumference of the circle.
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Observing how the difference between the two polygonal perimeters — one inside the circle, one outside — became smaller, Archimedes likely believed that as the number of sides increased, the difference between the perimeters of the inscribed and circumscribed polygons would converge toward zero, approaching the circumference of the circle.
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However, this approach relies on a massive assumption:
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That the perimeter of the circumscribed polygon is longer than the circumference, just because it lies outside the circle.
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That assumption is false.
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Some try to prove it via area relationships based on the pi. But that is problematic if the pi itself is the quantity under investigation.
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It ignores a crucial geometric reality:
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While that is true for the length, that assumption ignores a crucial geometric reality: as the number of sides increases the internal angles flatten toward 180°, — it is 180° - 360° / 96 = 176.25° in the case of a 96-gon — nearing a straight line rather than a curve, and the polygon no longer reflects the circle’s curvature.
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As the number of sides increases the internal angles flatten toward 180°, — it is 180° - 360° / 96 = 176.25° in the case of a 96-gon — nearing a straight line rather than a curve, and the polygon no longer reflects the circle’s curvature.
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In contrast, polygons with internal angles in the range between 150° and 160°, such as the 13- to 16-gon, preserve a meaningful bend that better reflects circularity.
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The definition of an inscribed polygon is that both its perimeter and area are smaller than the circle. The properties of a circumscribed polygon are larger.
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When the circle’s area and circumference is calculated with the constant 3.2, it becomes clear that the area of an isoperimetric 14‑gon is actually larger than the circle’s. A flat angle encloses the area differently than the curve. This flips the script: the polygon can enclose more area even with the same perimeter. As the number of sides increases the effect is stronger, so the isoperimetric polygon behaves like a circumscribed figure despite having equal perimeter. This overlooked disproportion shows that polygons do not approach the circle in every sense — above 13 sides, the comparison underestimates the circle.
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When the circle’s area and circumference is calculated with the constant 3.2, it becomes clear that the area of an isoperimetric 14‑gon is larger than the circle’s. A flat angle encloses the area differently than the curve. This flips the script: the polygon can enclose more area even with the same perimeter. As the number of sides increases the effect is stronger, so the isoperimetric polygon behaves like a circumscribed figure despite having equal perimeter. This overlooked disproportion shows that polygons do not approach the circle in every sense — above 13 sides, the comparison underestimates the circle.
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Archimedes pushed his method far beyond this curve-aligned threshold — and the result was a recursive underestimate.
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There are at least a dozen different calculus methods in use, but each and every one of those are solved through basic operations. Each notation should correspond to a real, logical property of the circle. Yet upon inspection, inconsistencies emerge. The formula doesn’t derive the circumference from first principles; it assumes it.
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The classical polygon-based approach to approximate a circle’s circumference relies on inscribed and circumscribed polygons, calculated using trigonometric functions aligned to π. But this alignment is problematic if π itself is the quantity under investigation.
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The classical polygon-based approach to approximate a circle’s circumference relies on inscribed and circumscribed polygons, calculated using trigonometric functions aligned to the pi. But this alignment is problematic if the pi itself is the quantity under investigation.
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Calculus may be a useful mathematical tool, but calling it exact is a bold statement.
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