Professional mathematicians genuinely convinced themselves that Babylonians and Egyptians did know that the hypotenuse of that triangle was the square root of 2, but because they didn't find a specific clay tablet or papyrus with the theorem, that they didn't really understand the relationship.🙂🙃
That would be like a future anthropologists finding a 5ft tape measure at a Philadelphia construction site, and concluding that 2023 humans could only count up to 60 inches. 🤡