Respostas

2014-03-11T17:00:33-03:00
Caso A

Xg = Xa + Xb + Xc / 3
Xg = -1 + 0 + 7 / 3
Xg = 6 / 3
Xg = 2

Yg = Ya + Yb + Yc / 3
Yg = 2 - 5 - 6 / 3
Yg = -9 / 3
Yg = -3

G (2, -3) 

Caso B

Xg = Xa + Xb + Xc / 3
Xg = 1 + 6 + 2 / 3
Xg = 9 / 3
Xg = 3

Yg = Ya + Yb + Yc / 3
Yg = 5 + 2 - 2 / 3
Yg = 5 / 3

G (3, 5/3)