Ancient Indian Geometry: Baudhayana's Sulba Sutra and the Pythagorean Theorem — E8 Intelligence Research
Year: 2026
Type: preprint
Abstract: FINDING: The Sulba Sutras contain explicit geometric constructions for ritual altars, including the earliest known statement of the Pythagorean theorem (Baudhayana, ~800 BCE) and methods for squaring the circle, doubling the square, and constructing altars with precise area ratios. | MATH: Baudhayana Sulba Sutra (I.48-49): *"dīrghasyākṣaṇayā rajjuḥ pārśvamānī, tiryaḍ mānī, ca yatpṛthagbhūte kurutastadubhayāṅ karoti."* — The diagonal of a rectangle produces both [areas] that the two sides separately produce. This is the Pythagorean theorem: \(c^2 = a^2 + b^2\). Also, the sutra gives an approximation for √2: \(1 + \frac{1}{3} + \frac{1}{3\cdot4} - \frac{1}{3\cdot4\cdot34} = \frac{577}{408} \approx 1.414215686\) (error ~2×10⁻⁶). For squaring the circle (Baudhayana I.58): side of square = \(\frac{7}{8} \times\) diameter + \(\frac{1}{8 \times 29}\) of diameter, i.e., \(s = d(\frac{7}{8} + \frac{1}{232}) = \frac{204}{232}d = \frac{51}{58}d\). This implies π ≈ 4×(58/51)² = 5.174? No — that's Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com
Author: Caldin, Andrew Stewart
Language: English
Subfield: Theoretical Computer Science
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7204915410
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