Where does “hình thang” come from?
hình thang (Vietnamese) comes from Vietnamese thẳng, from Chinese 湯, from Proto-Sino-Tibetan r-la(w)ŋ — steam; hot.
hình thang (Vietnamese): trapezoid/trapezium
Ancestry of “hình thang”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Vietnamese | thẳng | straight |
| 2 | Chinese | 湯 | — |
| 3 | Proto-Sino-Tibetan | r-la(w)ŋ | steam; hot |