Respostas

2014-05-20T22:03:01-03:00
Angulo = x
Triplo da metade ( 3x/2 )
Complemento ( 90-x )

3x/2 + 90-x = 140
3x/2 - x = 140 - 90 
3x-2x/2 = 50
3x-2x = 50.2
   x = 100