Bhāskara II's Lilavati §134 (1150 CE) gives the Pythagorean theorem in a single Sanskrit sentence: the square-root of the sum of the squares of the two legs is the diagonal. The same rule was already 2,000 years old when Bhāskara wrote it — the Indian Sulbasutras (~800 BCE) had stated it for constructing fire-altars. Pythagoras (~530 BCE) and the Sulbasutras are roughly contemporaneous; two traditions ran in parallel for two millennia and converged on the same result.