Construction of Right Angle by Stretched Rope/Historical Note

Historical Note on Construction of Right Angle by Stretched Rope
It was been suggested by that the technique for Construction of Right Angle by Stretched Rope may have been used by the ancient Egyptians to survey their fields.

It is believed that they were aware of the properties of the $3-4-5$ triangle, and so this is a feasible hypothesis, but no evidence exists that they ever used this specific technique.

Despite the fact that there exists no evidence for this, it is sometimes seen reported as though it were a 'well-known fact', whereas it is nothing of the sort.