We have the ancient (4000 years?) Egyptian triangles.
The simplest is 3 - 4 - 5. That is, the catheti 3 m and 4 m and the hypotenuse 5 m give a right angle.
https://sv.wikipedia.org/wiki/Pythagoreisk_trippel
The simplest is 3 - 4 - 5. That is, the catheti 3 m and 4 m and the hypotenuse 5 m give a right angle.
https://sv.wikipedia.org/wiki/Pythagoreisk_trippel