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[tex]\\ \tt\hookrightarrow m<12=180-122=58°[/tex]
[tex]\\ \tt\hookrightarrow m<4=m<2=59°[/tex]
Now
[tex]\\ \tt\hookrightarrow m<7=59+58=117°[/tex]
And
[tex]\\ \tt\hookrightarrow m<8=180-117=63[/tex]
[tex]\\ \tt\hookrightarrow m<9=m<11=122[/tex]