Where does “thẳng góc” come from?

thẳng góc (Vietnamese) comes from Vietnamese thẳng, from Chinese 湯, from Proto-Sino-Tibetan r-la(w)ŋ — steam; hot.

thẳng góc (Vietnamese): perpendicular; joining together to form a right angle

Definitions

  1. perpendicular; joining together to form a right angle

Ancestry of “thẳng góc”, step by step

thẳng góc traces back through two separate lines of ancestry.

via Vietnamese thẳng

StepLanguageWordMeaning
1Vietnamesethẳngstraight
2Chinese湯—
3Proto-Sino-Tibetanr-la(w)ŋsteam; hot

via Vietnamese góc

StepLanguageWordMeaning
1Vietnamesegóccorner; angle
Every word from Proto-Sino-Tibetan r-la(w)ŋ →Every word from Chinese 湯 →Every word from Vietnamese thẳng →
thẳng góc — Etymology, Origin & Word History | Etymology Explorer