Respostas

2014-05-15T21:54:06-03:00
1)
60+y=180
y=180-60
y=120°

x = y pois são alternos internos.

2)

x/3=x/2-25
x/3-x/2=-25
-x/6=-25
-x=-25x6
-x=-150°
x=150°

y+10+x/2-25=180°
y+10+150/2-25=180°
y+10+75-25=180°
y+60=180°
y=120°
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