You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert
Copy file name to clipboardExpand all lines: index.html
+10-8Lines changed: 10 additions & 8 deletions
Original file line number
Diff line number
Diff line change
@@ -3148,8 +3148,10 @@ <h4 style="margin:12px">Archimedes and the Polygonal Trap</h4>
3148
3148
<br>
3149
3149
<br>
3150
3150
<pstyle="margin:12px">The Greek Archimedes’ method for estimating the π is often celebrated as a foundational triumph of geometric reasoning.
3151
-
</p>
3152
3151
<br>
3152
+
<br>
3153
+
He approximated the circle using inscribed and circumscribed polygons.
3154
+
</p>
3153
3155
<div>
3154
3156
<details>
3155
3157
<summarystyle="margin:12px">But that method itself introduced compounding errors. These include:
@@ -3165,20 +3167,20 @@ <h4 style="margin:12px">Archimedes and the Polygonal Trap</h4>
3165
3167
</summary>
3166
3168
<br>
3167
3169
<br>
3168
-
<pstyle="margin:12px">Archimedes approximated the circle 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. He then increased the number of sides to 96, observing how the difference between the two polygonal perimeters — one inside the circle, one outside — became smaller.
3170
+
<pstyle="margin:12px">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. He then increased the number of sides to 96, observing how the difference between the two polygonal perimeters — one inside the circle, one outside — became smaller.
3169
3171
<br>
3170
3172
This narrowing gap was key. 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.
3171
3173
<br>
3172
3174
He assumed that more sides mean closer resemblance to a circle. That was backed by the isoperimetric inequality theory, which states that a circle maximizes area for a given perimeter. That idea likely emerged from observing simple polygons: the triangle has the smallest area, the square is larger, and so on. From this pattern, it was assumed that the trend continues indefinitely — that a polygon with an infinite number of sides would resemble a circle perfectly, with its area approaching from below.
3173
3175
<br>
3174
3176
<br>
3175
-
But that assumption ignores a crucial geometric reality: <strong>as the number of sides increases, the internal angles of the polygon approach 180° — it is 180° - 360° / 96 = 176.25° in the case of a 96-gon —, nearing a straight line rather than a curve. 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.</strong>
3177
+
But that assumption ignores a crucial geometric reality: as the number of sides increases, the internal angles of the polygon approach 180° — it is 180° - 360° / 96 = 176.25° in the case of a 96-gon —, nearing a straight line rather than a curve. 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.
3176
3178
<br>
3177
3179
<br>
3178
3180
Archimedes pushed his method far beyond this curve-aligned threshold — and the result was a recursive underestimate. The perimeter of the circumscribed polygon that he believed to be an overestimate of the circumference was practically an underestimate of it.
3179
3181
<br>
3180
3182
<br>
3181
-
Thus his final result of 3.14... lies between two underestimates. <br>
3183
+
Thus his final result of 3.14... lies between two underestimates.
3182
3184
<br>
3183
3185
<br>
3184
3186
What we’re left with is not a proof, but a layered approximation — one that has shaped centuries of geometry, but now deserves a closer, more rational reexamination.
@@ -3187,7 +3189,10 @@ <h4 style="margin:12px">Archimedes and the Polygonal Trap</h4>
3187
3189
The classical polygon-based approach to approximating 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.
3188
3190
<br>
3189
3191
<br>
3190
-
Instead, we begin with a strong geometric foundation: the area of a circle is exactly 3.2r². This gives us reason to suspect that the true circumference is 6.4r, not 2πr. To test this, we reframe the polygon approximation method.
3192
+
The equal distance polygon method upgrades the classical approach by replacing inherited assumptions with geometric conditions — and aligns the approximation process with the true nature of the circle.
3193
+
<br>
3194
+
<br>
3195
+
We begin with a strong geometric foundation: the area of a circle is exactly 3.2r². This gives us reason to suspect that the true circumference is 6.4r, not 2πr. To test this, we reframe the polygon approximation method.
3191
3196
<br>
3192
3197
<br>
3193
3198
Rather than treating inscribed and circumscribed polygons separately and relying on assumptions about how their perimeter gaps behave as the number of sides increases, we introduce a creative and grounded condition: equal distance between the polygon’s sides, vertices, and the circle’s arc.
@@ -3203,9 +3208,6 @@ <h4 style="margin:12px">Archimedes and the Polygonal Trap</h4>
3203
3208
<br>
3204
3209
<br>
3205
3210
- The 96-gon converges precisely to a circumference of 6.4, confirming the area-based ratio.
3206
-
<br>
3207
-
<br>
3208
-
This method upgrades the classical approach by replacing inherited assumptions with geometric conditions — and aligns the approximation process with the true nature of the circle.
0 commit comments