Giải thích các bước giải:
\(\widehat{yOt}\): góc yOt
\(\widehat{yOn}\): góc yOn
\(\widehat{yOm}\): góc yOm
\(\widehat{tOn}\): góc tOn
\(\widehat{tOm}\): góc tOm
\(\widehat{tOx}\): góc tOx
\(\widehat{nOm}\): góc nOm
\(\widehat{nOx}\): góc nOx
\(\widehat{mOx}\): góc mOx
Tổng cộng: 9 góc