Where does “triangolo rettangolo” come from?
triangolo rettangolo (Italian) comes from Italian rettangolo, from Latin rectangulus, from Latin rēctus, from Latin regō, from Proto-Italic regō, from Proto-Indo-European h₃réǵeti, from Proto-Indo-European h₃reǵ- — to straighten, to right oneself; right; just.
triangolo rettangolo (Italian): right triangle
Ancestry of “triangolo rettangolo”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Italian | rettangolo | right-angled; rectangle |
| 2 | Latin | rectangulus | rectangular |
| 3 | Latin | rēctus | — |
| 4 | Latin | regō | — |
| 5 | Proto-Italic | regō | — |
| 6 | Proto-Indo-European | h₃réǵeti | to be straightening, to be setting upright |
| 7 | Proto-Indo-European | h₃reǵ- | to straighten, to right oneself; right; just |