Respuesta :

1)
[tex]180 - (37 + 90) = 180 - 127 \\ = 53[/tex]
2)
[tex](180 - 15) \div 2 = 165 \div 2 \\ = 82.5[/tex]
each of other angles measures 82.5 degrees

3)
[tex]180 - (42 + 20) = 180 - 62 \\ = 118[/tex]
4)sorry I don't know the last one