Resposta:
a) 130 graus e b) 105 graus
Explicação passo a passo:
a)
[tex]\frac{13\pi}{18} -- x graus\\\\\pi -- 180 graus\\\\\pi .x= 180. \frac{13\pi}{18}\\\\x = \frac{2340}{18} \\\\x= 130 graus[/tex]
(simplifiquei o [tex]\pi[/tex] pelo outro [tex]\pi[/tex] -- cortei)
b)
[tex]\\\\\\\\\\\frac{7\pi}{12} -- x graus\\\\\pi -- 180 graus\\\\\pi .x= 180. \frac{7\pi}{12}\\\\x = \frac{1260}{12} \\\\x= 105 graus[/tex]
(simplifiquei o [tex]\pi[/tex] pelo outro [tex]\pi[/tex] -- cortei)
