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v = (-8,0) - (0,4) = (-8,-4)
w = (-1,-4) - (0,4) = (-1,-8)
luego hallo el vector ortogonal a w:
NOTA: si (a,b) es un vector, entonces un vector ortogonal a este es (-b,a)
w' = (8,-1)
Hallo el producto escalar:
v * w' = (-8)(8) + (-4)(-1)
v * w' = -64 + 16
v * w' = -48
ÁREA DEL TRIÁNGULO