Where does this definition of an external angle come from?
This entry for an external angle is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Is an external angle a noun, verb, or something else?
In this entry, an external angle is tagged as 2n..
What is Lughet?
Lughet is a free trilingual dictionary covering nearly five million entries across Uyghur, Chinese, and English, drawn from more than ten source dictionaries and corpora.