Todas as dúvidas que tiver sobre Trigonometria (ângulos, senos, cosenos, tangentes, etc.), Geometria Plana, Geometria Espacial ou Geometria Analítica
06 nov 2013, 01:28
180=z+140 180=y+80 x+y+z=180
z=40° y=100° x+40+100=180
x=40°
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